molecular biogeochemistry, lecture...
TRANSCRIPT
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12.458 Lecture 8
Molecular Fossils from Land Plants Readings and talks for Monday Nov 8th:
Murray et al., OG 1998 Speelman OG 2009 Topics for presentaJons Monday Nov 8: Biomarkers from ferns? Azolla or Anabaena Biomarkers for lichens mosses primiJve plants like ginko structures and origins of fernenes lupanes and taraxastanes, Perylene isotopic composiJon of leaf wax isotopic composiJon of plant terpenes
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VIRIDAEPLANTAE
hRp://tolweb.org/tree?group=Green_plants
Richard M. McCourt, R. L. Chapman, M. A. Buchheim and Brent D. Mishler
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VIRIDAEPLANTAE
hRp://tolweb.org/tree?group=Green_plants
• Green plants as defined here includes a broad assemblage of photosyntheJc organisms that all contain chlorophylls a and b, store their photosyntheJc products as starch inside the double-‐membrane-‐bounded chloroplasts in which it is produced, and have cell walls made of cellulose (Raven et al., 1992). In this group are several thousand species of what are classically considered green algae, plus several hundred thousand land plants.
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VIRIDAEPLANTAE-‐ CHLOROPHYCEAE
hRp://tolweb.org/tree?group=Green_plants
Chlorellales, especially Chlorella are an important group because of their role as endosymbionts inside the Jssues of sponges, ciliates and formams. Green algae produce bioplymers, algeanans, which are recalcitrant, non-‐hydrolysable biopolymers and feedstock for crude oil.
http://tolweb.org/tree?group=Green_plants
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Figure 1. Ternary diagram s h o w i n g t h e r e l a J v e percentages of C27, C28, and C29 sterols among modern members of the Plantae, including green algae, red algae, and glaucocystophytes. Early divergent species are shown in black. Individual t a x a a n d a s s o c i a t e d references are given in Table S1 in SupporJng InformaJon.
Courtesy Elsevier, Inc., hRp://www.sciencedirect.com. Used with permission.
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Figure 2. The mean fracJonal contents of C27–29 sterols across green algal classes, with populaJon standard deviaJons.
Courtesy Elsevier, Inc., hRp://www.sciencedirect.com. Used with permission.
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Figure 3. The mean fracJonal contents of C27–29 sterols across marine species of red and g reen a l gae , w i th p o p u l a J o n s t a n d a r d deviaJons. For comparison, the mean values from analysis of total (marine plus non-‐marine) data for each group also are displayed.
Courtesy Elsevier, Inc., hRp://www.sciencedirect.com. Used with permission.
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Figure 4. C28/C29 sterol raJos for all green algal species in the dataset (black). For comparison, all early divergent taxa are shown in a separate area on the right side and are color-‐coded according to phylum: green = green algae, red = red algae, b l u e = g l a u c o c y s t o p h y t e s . O n e glaucocystophyte highlighted in Fig. 1 does not appear here, because the raJo is undefined; and two green algal species have C28/C29 raJos = 0. The red point next to the arrow is off-‐scale (C28/C29 raJo = 7.2). The green arrow in the column of prasinophytes points to Halosphaera, the only prasinophyte with a microfossil record. The gray box indicates the range of C28/C29 sterane raJos found in bitumens and petroleums from Ediacaran and Paleozoic rocks.
Courtesy Elsevier, Inc., hRp://www.sciencedirect.com. Used with permission.
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C28/C29 Sterane RaJos: The Rise of Modern Plankton
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Paul Kenrick and Peter Crane hHp://tolweb.org/tree?group=Embryophytes&contgroup=Green_plants
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Oldest evident land plant = Late Ordovician spore
Oldest N. Hemisphere vascular plant = Late Silurian Cooksonia
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Earliest Land Plants - Lycopsids
Baragwanathia longifolia Upper Silurian and Lower Devonian of Australia To the led a fossil, to the right a reconstrucJon of a part of the plant.The sporangia are in the axils of the leaves. Drawing J. Hulst
hRp://www.xs4all.nl/~steurh/eng/ebaragw.html
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Ferns Kathleen M. Pryer and Alan R. Smith
hRp://tolweb.org/tree?group=Filicopsida&contgroup=Embryophytes#JtlefigcapJon
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FERNS date back to at least the Middle Devonian. They include four living groups: Marattiales, Ophioglossales, Psilotales and leptosporangiate ferns. Some early groups that are now extinct, including the Stauropteridales and Zygopteridales. The chart below shows the stratigraphic ranges over which each group is known to have existed. The green taxa on the right side of the chart are groups of ferns; the blue taxa to the left are Sphenophytes or Sphenopsids; and the purple Cladoxylopsida in the center are a closely related group. Of all living ferns, only the Psilotales has no fossil record
FERNS
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Biomarkers for Azolla or Anabaena????
Courtesy Elsevier, Inc., hRp://www.sciencedirect.com. Used with permission.
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Conifers
Coniferales
Araucariaceae Cretaceous to Recent 36 extant species Southern Hemisphere
Cephalotaxaceae Jurassic to Recent 5 extant species Northern Hemisphere
Cupressaceae Triassic to Recent 157 extant species both Hemispheres
Pinaceae Cretaceous to Recent 250 extant species Northern Hemisphere
Podocarpaceae Triassic to Recent 131 extant species Southern Hemisphere
Cheirolepidaceae Triassic to Cretaceous extinct Global
Palissyaceae Triassic to Jurassic extinct Global
Utrechtiaceae Carboniferous to Permian extinct Global
Taxales
Taxaceae Jurassic to Recent 9 extant species Northern Hemisphere
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hRp://www.ucmp.berkeley.edu/plants/plantaefr.gif
Time Chart for Land Plants
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Diterpanes from Conifers? Abundances in rocks and oils track evolution of vascular plants and possibly green algae (David Zinniker PhD Thesis, Stanford, 2003/4)
PIMARANE LABDANE
ISOPIMARANE FICHTELITE
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Diterpanes
PHYLLOCLADANE ent-‐BEYERANE
KAURANE
CH3
H
CH3
H
ent-‐16α(H)
ent-‐16β(H)
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Bicyclic Sesquiterpanes: possible bacteriohopane degradation products
EUDESMANE DRIMANE
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Diagnostic Plant Triterpanes
HO
oleanane
bicadinane
polycadinene resin
angiosperms/dipterocarps?
angiosperm β-‐amyrin
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The Molecular Fossil Record of Oleanane and Its Relation to Angiosperms
J. Michael Moldowan, Jeremy Dahl, Bradley J. Huizinga, Frederick J. Fago, Leo J. Hickey, Torren M. Peakman, David Winship Taylor
Oleanane has been reported in Upper Cretaceous and Tertiary source rocks and theirrelated oils and has been suggested as a marker for flowering plants. Correspondence of oleanane concentrations relative to the ubiquitous microbial marker 17 -hopane withangiosperm diversification (Neocomian to Miocene) suggests that oleanane concentra-tions in migrated petroleum can be used to identify the maximum age of unknown orunavailable source rock. Rare occurrences of pre-Cretaceous oleanane suggest either
that a separate lineage leads to the angiosperms well before the Early Cretaceous or that other plant groups have the rarely expressed ability to synthesize oleanane precursors.
α
SCIENCE VOL. 265 5 AUGUST 1994••
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AGSOstd_vial2B 1 mg + 50 ng D4, 1/85 ul
55.00 56.00 57.00 58.00 59.00 60.00 61.00 62.00 63.00 64.00 65.00 66.00 67.00 68.00 69.00 70.00 Time 0
100 % 0
100 % 0
100 % 0
100 % 0
100 %
03100229 2: MRM 24 Channels EI+ 426.421 > 191.179
6.03e7 65.12
63.92 63.04 64.09 65.38
65.84 66.07 66.87 03100229 2: MRM 24 Channels EI+
412.406 > 191.179 1.34e8 63.04
62.81 60.84 60.13 61.72 63.20 63.82 65.12 64.77
03100229 2: MRM 24 Channels EI+ 398.39 > 191.179
1.53e8 61.24
55.63 59.79 61.36 63.04 62.23
03100229 2: MRM 24 Channels EI+ 384.374 > 191.179
2.05e7 61.24 58.92
56.54 55.91 58.15 57.61 58.61 59.12 60.23 59.77 60.86 61.36 62.23 63.04 03100229 2: MRM 24 Channels EI+
370.359 > 191.179 6.20e7 57.38
55.63 56.13 56.54
58.25 58.11
58.53 59.20
bicadinane isomer
bicadinane isomers best revealed in 412à369 and 426à 381 GC-‐MS-‐MS
oleananes 18α + 18β
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Angiosperm Origins: The two compeJng hypotheses for angiosperm origins paint very different pictures about the biology of the earliest flowering plants. The Paleoherb Hypothesis suggests that the basal lineages were herbs with rapid lifecycles. Magnoliid Hypothesis suggests that the basal lineages were small trees with slower lifecycles. ( Dicots=tricolpate dicots; Magnol=magnoliids; Mono=monocots; Palherbs=paleoherbs )
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http://www.ucmp.berkeley.edu/anthophyta/anthophytafr.html#origin
• The Woody Magnoliid Hypothesis -‐-‐ CladisJc analyses by Doyle and Donoghue favor an early angiosperm with morphology similar to living members of the Magnoliales and Laurales.
• These groups are small to medium-‐sized trees with long broad leaves and large flowers with indeterminate numbers perianth parts. The carpels are imperfectly fused, and make a physical intermediate between a folded leaf and fused pisJl. This hypothesis is also favored by molecular studies, and so currently is favored by systemaJc botanists.
• It suggests that the earliest angiosperms were understory trees and shrubs, and that the flower was NOT the key innovaeon for the rapid diversificaeon of angiosperms. In fact woody magnoliids are not parecularly diverse, even today.
• The Paleoherb Hypothesis -‐-‐ The alternaJve view is an herbaceous origin for the angiosperms. This view has been championed in recent years by Taylor and Hickey, paleobotanists whose cladisJc analysis of angiosperms suggests a very different scenario from that previously described. In their analysis, the basal angiosperms are tropical paleoherbs, a group of flowering plants with uncomplicated flowers and a mix of monocot and dicot features.
• The implicaeon here is that the key innovaeons of flowers and a rapid life cycle were present in the earliest angiosperms. It has been suggested that changes in climate or geography provided opportuniees for these early angiosperms to diversify.
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Accepted species tree for seven plant model species. Names of clades are indicated at internal nodes. See text for discussion of strength of evidence for this phylogeny. Sanderson and McMahon BMC Evolu7onary Biology 2007 7(Suppl 1):S3 doi:10.1186/1471-‐2148-‐7-‐S1-‐S3
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Key results: Based on the analysis for which we set fossils to fit lognormal priors, we obtained an esJmated age of the angiosperms of 167–199 Ma (Early Jurassic) and the following age esJmates for major angiosperm clades: Mesangiospermae (139–156 Ma); Gunneridae (109–139 Ma); Rosidae (108–121 Ma); Asteridae (101–119 Ma). • Conclusions: With the excepJon of the age of the angiosperms themselves, these age esJmates are generally younger than other recent molecular esJmates and very close to dates inferred from the fossil record.
AJB Advance Access Published online ahead of print July 19, 2010; doi:10.3732/ajb.0900346 American Journal of Botany Research Arecle The age and diversificaeon of the angiosperms re-‐revisited1 Charles D. Bell2,5, Douglas E. Soles3 and Pamela S. Soles4
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Courtesy Elsevier, Inc., hRp://www.sciencedirect.com. Used with permission.
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Anderson’s Resin Classification Scheme
C l a s s I
p o l y m e r i c l a b d a n o i d d i t e r p e n e s ; + o c c l u d e d s e s q u i -‐ , d i a n d t r i t e r p e n o i d s A g a t h i s / A r a u c a r i a -‐ B a l t i c a m b e r H y m e n a e a -‐ D o m i n i c a n , M e x i c a n a m b e r
I I p o l y m e r i c s e s q u i t e r p e n e s ; p o l y c a d i n e n e + o c c l u d e d s e s q u i -‐ a n d t r i t e r p e n o i d s D a m m a r / D i p t e r o c a r p a c e a e -‐ S E A s i a
I I I p o l y s t y r e n e I V n o n -‐ p o l y m e r i c c e d r a n e s e s q u i t e r p e n o i d s V n o n -‐ p o l y m e r i c a b i e t a n e / p i m a r a n e d i t e r p s
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Semantics
• resins - solid, discrete organic materials derived from higher plant resins - modern samples
• amber = resinite - fossil samples
• balsam, elemi, incense, dammar, sandaracs, mastics and copals-common
resins from specific taxa
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Resin Characterisation Tools • 1960’s IR, C, H, O, plus volatiles & extracts
• recently- bulk 13C, D and 18O data
GC-MS of extractables pyrolysis-GC-MS of polymers
• this study- ditto plus Compound Specific Isotope Analysis plus data on other
recalcitrant products leaf wax, leaf biopolymer
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Australian Coastal Resinites
R e s i n P e d i g r e e δ 1 3 C B a l e s B a y , K a n g a r o o I s D E A G S O # 6 1 8 3 -‐ 2 7 . 3 N o T w o R o c k s S A D E A G S O # 6 1 8 4 -‐ 2 8 . 0 T h r e e M i l e R o c k s S A D E A G S O # 6 1 8 7 n d L a k e B o n n e y S A D E A G S O # 6 1 8 6 n d B r u n e i r e s i n i t e B e l a i t F m # 6 1 8 2 -‐ 2 6 . 2 G i p p s l a n d r e s i n i t e Y a l l ou n r # 1982 -‐ 2 2 . 3 K a u r i r e s i n S A m u s e u m # 6 2 8 1 -‐ 2 4 . 9 R e c e n t d a m m a r F l u k a l a b g r a d e -‐ 2 8 . 0
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COOH
CH 2
+
“leaf resins” e.g.
phyllocladenes, pimaradienes
+ “resin acids”,
e.g. abieJc acid
labdatriene polymer
Thermal dissociaJon
ReducJon, defuncJonalisaJon, intra-‐molecular cyclisaJon
H
CH 3
labdanes
isopimaranes
phyllocladanes
fichtelites, simonellite
Class I “Conifer” Resins and Associated Diterpenoids
+
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Thermal dissociaJon reducJon, intra-‐molecular
cyclisaJon
polycadinene
cadinanes bicadinanes
trans-‐trans-‐trans T, T1, R
cis-‐cis-‐trans W
Class II “Angiosperm” Resins
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Kauri Resinite (Class I) -‐ Pyrolysate
-‐24.6 ‰ -‐24.8‰
bicyclic hydrocarbons, various isomers &
homologues
R
CH 2
labdatriene polymer
bulk resinite -‐ 24.9 ‰
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Bulk Carbon Isotope ComposiJon of Modern & Fossil Resins
Mean +/-‐ 1 SD
-‐34.0
-‐30.0
-‐26.0
-‐22.0
-‐18.0
-‐ 22.8 ‰
-‐ 25.5 ‰ -‐ 27.3 ‰
-‐ 31.0 ‰
Class I Class II
n = 13 n = 17 n = 18 n = 31
‰
Fossil Recent Fossil Recent
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min 10 20 30 40 50 60 70
Drybanolops lanceolata #9105 resin = -‐28.6 ‰ #9099
13C Heterogeneity within an Angiosperm
-‐40.6 ‰
-‐40.6 ‰
-‐42.3 ‰
leaves vs trunk resin
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min 10 20 30 40 50 60 70
Shorea leprosula #9106
resin = -‐32.7 ‰ #9096
13C Heterogeneity within an Angiosperm
-‐37.2 ‰ C32
-‐34.8 ‰ C31
-‐32.5‰ C29
-‐32.3 ‰ C33 -‐38.4 ‰
C33
-‐34.9 ‰ C30
leaves vs trunk resin
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min 10 20 30 40 50 60 70
Agathis borneensis #9107 resin = -‐26.3 ‰ #9097
13C Heterogeneity within a Gymnosperm
-‐36.6‰
-‐35.7‰
C29
C31
-‐35.4 ‰ C33
tetracyclic diterpenoids
sesquiterpenoids
-‐32.3‰
-‐31.5‰
-‐33.6‰ -‐31.3‰
-‐34.1‰
-‐30.4‰
-‐33.3‰ -‐34.3‰
leaves vs trunk resin
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min 10 20 30 40 50 60 70
13C Heterogeneity within a Gymnosperm
Araucaria heterophylla #9128
resin = -‐27.2 ‰ #9127
-‐30.2 ‰
-‐30.3 ‰
-‐29.3 ‰ -‐29.1 ‰
-‐31.1 ‰
phyllocladane H
CH3
leaves vs trunk resin
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Gippsland Basin-‐Late Cretaceous Tuna #2 Sediment-‐Br/Cyc
-‐28.6 ‰
-‐23.0 ‰
-‐28.7 ‰ -‐25.9 ‰
H H pristane plants
C30-‐hopane plants + bacteria
C31-‐hopane heterotrophic
bacteria
-‐ 29.1 ‰
phytane plants +?
n-‐alkanes leaf waxes & biopolymers
-‐ 28.7 to -‐ 31.2 ‰ Cn
phyllocladane conifer resins
H
CH3
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Brunei Resinite (Class II) Pyrolysate
-‐ 25.7 ‰ -‐ 26.6 ‰
-‐ 26.4 ‰
bulk resinite -‐ 26.2 ‰
cct
Rt bicadinanes cadinanes
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NZ Taranaki Basin-‐Maui Oil-‐Br/Cyc
-‐25.9 ‰
-‐28.7‰ isopimarane conifers ?
pristane plants
n-‐alkanes leaf waxes, leaf biopolymers
Cn
-‐ 25.5 to -‐ 29.9 ‰ phytane -‐30.5‰
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S. Sumatra Basin Oil -‐ Br/Cyc
-‐29.8 ‰
-‐27.9 ‰ -‐27.9 ‰
cct Rt
bicadinanes pristane
n-‐alkanes leaf waxes, leaf biopolymers
-‐ 26.6 to -‐ 33.6 ‰ Cn
phytane -‐33.9 ‰
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Gippsland Basin-‐Dolphin oil-‐B/C
H CH 3
~ -‐27.8 ‰
pristane plants
phyllocladane conifer resins
-‐ 24.3‰
n-‐alkanes leaf waxes, leaf biopolymers
-‐ 26.7 to -‐ 30.3 ‰
Cn phytane plants & methanogens? -‐41.5 ‰
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Plants opJmise stomatal conductance to maximise access to CO2 & minimise loss of water ∴ water conservaJve plants have
isotopically ‘heavier’ carbon
Conifer Needle leaf morphology Water conservaJve
Restricted access to CO2 Discriminates less against 13C δ13C values for wood typically:
Angiosperm Broad leaf morphology Less water conservaJve Less restricted access to CO2 Discriminates more against 13C δ13C values for wood typically: ~ -‐ 21 ‰ ~ -‐ 24 ‰
Average 3 ‰
difference in δ13C
*Data from Stuiver and Braziunas, 1987 for 40º laJtude, modern plants
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Fluvio-‐Deltaic oils -‐ n-‐alkane isotope profiles
n-‐alkane
Average for all Fluvio-‐Deltaic oils
mostly angiosperm OM?
Average for Gippsland oils
mostly conifer OM ?
7 11 15 19 23 27 31 33
δ13C
-‐ 34
-‐ 32
-‐ 30
-‐ 28
-‐ 26
-‐ 24
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oleanane/hopane
δ13 C Sats
Gippsland Basin, Oz
Taranaki Basin, NZ
Oils with Conifer vs Angiosperm OM Carbon Isotopes vs Oleanane/Hopane
-‐29.0
-‐28.0
-‐27.0
-‐26.0
0.0 0.2 0.4 0.6 0.8
Affected by migraJon contaminaJon
Maui
McKee
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Hopane Strong Marine
Influence
Moderate Marine Influence
LiRle Marine Influence
Picenes
Angiosperms
GCMS of C30 Triterpanes
Oleananes
Oleanoid Triterpanes
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Catagenesis of POLYCADINENE from Dipterocarps and other higher plants produces many compounds found in oils, e.g.....
Bicadinanes
Diaroma7c Secobicadinanes
Diaroma7c Secotricadinanes
Cadalenes
Compounds “W”, “T”, “R”
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-‐ 33 -‐ 31 -‐ 29 -‐ 27 -‐ 25 -‐ 23 -‐ 21 -‐ 19 -‐ 17 -‐ 15
13 15 17 19 21 23 25 27 29 31
Ol/Hop = 0.29
Ol/Hop = 0.14
n-‐alkane
Galoc, P’Pines
Kora, NZ
Land plant input to marine oils: biomarkers vs. isotopes
δ13C ‰"
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n-alkane"
δ13C ‰"
Maui (FD 5)"
Average FD"
Average Gippsland"
McKee (FD 4)"
N-‐alkane isotope profiles for fluvio-‐deltaic (FD) oils
-35"
-33"
-31"
-29"
-27"
-25"
7" 9" 11"13"15"17"19"21"23"25"27"29"31"33"
Conifer
Angiosperm
Mixed
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oleanane/hopane
δ13 C Sats
Gippsland Basin, Oz
Taranaki Basin, NZ
Oils with Conifer vs Angiosperm OM Carbon Isotopes vs Oleanane/Hopane
-‐29.0
-‐28.0
-‐27.0
-‐26.0
0.0 0.2 0.4 0.6 0.8 Data from AGSO/Geomark Biodegraded oils excluded
Affected by migraJon contaminaJon
Maui
McKee
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Summary
• Conifer resins have more 13C than angiosperm resins • Ditto for derived biomarkers • Significant variability within single plants and within resin types
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• Gymnosperm-Angiosperm balance likely an important control on δ13C of terrestrial-C • Secular change in terrestrial-C best studied using taxon-specific biomarkers; rigorous age control will be required • Resin studies useful for understanding oil composition & hydrocarbon origins
Summary
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Applying carbon isotope raJos (δ 13C) in deltaic petroleum systems
• Carbon isotope raJos of whole oils or oil fracJons (saturates, aromaJcs etc) are not very useful for deltaic oils/sediments because: • The δ13C values are more affected by secondary processes than those of marine or lacustrine samples • There is sJll an inadequate understanding of the fundamental factors controlling the carbon isotope composiJon of land-‐plant derived oils
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12.158 Molecular Biogeochemistry Fall 2010
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