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the maximum TOC contents of 5.07%
and 14.6%, respectively. The main factors
that affect the quantity and quality
of marine organic matter include primary
productivity, depositional processes,
and redox conditions during deposition
and the early diagenesis stage.
Three intervals of marine good quality
source rocks are identified in this section;
they are lower Chihsia Formation, topmost
Maokou Formation, and the middle
segment of the Dalong Formation. They
are formed in anoxic environments, in
association with high primary productivity.
Among these, high productivity in
the lower Chihsia interval may originate
from an upwelling flow area, whereas,
in the rest of the intervals, it is inferred
to be related to hot fluid activity due to
volcanic eruption. The results of this
study suggest that good quality marine
source rocks in the Permian strata offer
significant hydrocarbon potential.
2010010034
四 川 华 蓥 山 地 区 穿 越 P\T 界 线 的 钙 质
微 生 物 岩 中 有 机 物 质 的 出 现 = Occurrence
of Organic Matter in Calcimicrobialites
across Permian–Triassic Boundary
in Huayingshan Region, Sichuan,
South China. ( 英 文 ). Yang Hao; Wang
Yongbiao; Chen Lin. Journal of China
university of geosciences, 2008, 19(5):
518-525
Calcimicrobialites across the Permian-Triassic
boundary in Huayingshan
region were investigated using the fluorescence
microscopic measurements to
understand the occurrence of organic
matter. The microbialites are composed
of micrite matrix and coarse spar cement.
Abundant rhombic or magnetic needlelike
carbonate minerals were observed
adrift within the cement. The fluorescence
microscopic measurement indicates
the micrite matrix in microbialites
shows the most abundant organic matter,
with the rhombic or magnetic needlelike
carbonate minerals and coarse spar
cement coming to the 2nd and the 3rd,
respectively. Organic matter is mainly
preserved in the space between the
grains of the micrite minerals but almost
evenly distributed in the rhombic or
magnetic needle-like carbonate minerals.
As one of the common diagenesis types,
dolomitization is observed to occur in
the microbialites in Huayingshan. However,
the carbonate cement in microbialites
still has high content of element Sr
as shown by the microprobe analysis,
reflecting that the dolomitization might
have happened in a restricted environment.
Observation under the fluorescence
microscope shows that dolomitization
just led to the redistribution of
organic matter in the grain space of
dolomite minerals, inferring that the
diagenesis has a slight effect on the
preservation, and thus on the content of
organic matter in the microbialites.
2010010035
华 北 轩 隆 凹 陷 中 元 古 代 初 级 生 产 力 和
古 环 境 条 件 的 分 子 证 据 = Molecular
Evidence for Primary Producers and Paleo-environmental
Conditions in Mesoproterozoic
in the Xuanlong Depression
in North China. ( 英 文 ). Luo Genming;
Xie Shucheng; Wu Wenjun; Sun Si;
Huang Junhua; Shi Xiaoying. Journal of
China university of geosciences, 2008,
19(5): 567-576
The molecular organic compounds
have been identified by gas chromatography
(GC) and GC-mass spectrometry
(GC-MS) from Mesoproterozoic rocks
in the Xuanlong depression in North
China. The main saturated compounds
are n-alkanes, monomethylalkanes, n-
alkylcyclohexanes, acyclic isoprenoids,
and hopanes. The dominant lowermolecular-weight
n-alkanes are indicative
of the main contribution of microorganisms,
in particular, the chemosynthetic
bacteria. The presence of abundant
monomethylalkanes (mid- and endbranched)
and the long chained (>C 20 )
acyclic isoprenoids indicates the existence
of abundant bacteria and/or ar-
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