Stable isotope (δ13Cker, δ13Ccarb, δ18Ocarb) distribution along a Cambrian outcrop section in the eastern Tarim Basin, NW China and its geochemical significance
Stable isotope (δ13Cker, δ13Ccarb, δ18Ocarb) distribution along a Cambrian outcrop section in the eastern Tarim Basin, NW China and its geochemical significance
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塔里木盆地东部寒武系露头剖面稳定同位素（δ13Cker、δ13Ccarb、δ18Ocarb）分布及其地球化学意义
DOI：
10.1016/j.gsf.2016.02.004
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发表时间：
2017
影响因子：
8.9
通讯作者：
Zhang Haizu
中科院分区：
文献类型：
--
作者：
Liu Hu;Liao Zewen;Zhang Haizu
以塔里木盆地东部雅尔当山露头为研究对象，结合TD 2沿着取心样品，研究了雅尔当山下古生界的地球化学特征。综合研究了沉积演化过程中总有机碳丰度、生烃前体生物种类、有机质和碳酸盐的稳定同位素比值（δ 13 Cker、δ 13 Ccarb和δ 18 Ocarb）等可能的相关制约因素。结果表明，寒武系干酪根的δ 13 Cker（VPDB）值沿着露头剖面变化在−34.6‰ ~ −28.4‰之间，从下寒武统到上寒武统有逐渐增大的趋势。这与δ 13 C碳和δ 18 O碳的变化基本一致，可能与海平面的变化以及底栖生物和浮游生物组成的变化有关。塔里木盆地东部寒武系烃源岩稳定碳同位素比值沿剖面变化较大，沿着剖面可达6‰，反映了烃源岩的非均质性。因此，TD 2 ∈井富含13 C的原油可能来自寒武系烃源岩的局部地层。研究结果表明，塔里木盆地寒武系-下奥陶统可能存在多个物源灶。
This study investigated the geochemical features of the lower Paleozoic strata of Yaerdang Mountain outcrop along with the core samples from well TD2∈ in the eastern Tarim Basin, NW China. The total organic carbon abundance, hydrocarbon-generating precursor biospecies, and stable isotope ratios of organics and carbonate (δ13Cker,δ13Ccarbandδ18Ocarb) were comprehensively studied for their possible correlative constraints during sedimentary evolution. The results revealed that theδ13Cker(VPDB) of Cambrian kerogens along the outcrop section varied from −34.6‰ to −28.4‰, indicating an increasing tendency from the lower Cambrian to the upper Cambrian. This was on the whole accompanied by the variation in theδ13Ccarbandδ18Ocarbalong the profile, which might be associated with the changes in the sea level and also in the compositional variation of benthic and planktonic biomass. The large variation in the stable carbon isotope ratios up to 6‰ along the outcrop section reflected the heterogeneity of the Cambrian source rocks from the eastern Tarim Basin. Hence, the13C-enriched crude oils from well TD2∈ might have been derived from a localized stratum of Cambrian source rocks. The results from this study showed the possibility of multiple source kitchens in the Cambrian–lower Ordovician portion of Tarim Basin.
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影响因子：
--
作者：
He DaMing;Liu Jiang;Gan Su
通讯作者：
Gan Su
影响因子：
7.5
作者：
Huang Hai-ping
通讯作者：
Huang Hai-ping
影响因子：
--
作者：
Yankuan Tian;Chupeng Yang;Z. Liao;Haizu Zhang
通讯作者：
Yankuan Tian;Chupeng Yang;Z. Liao;Haizu Zhang
影响因子：
2.9
作者：
BERNER, RA
通讯作者：
BERNER, RA
华南扬子地台从斜坡到盆地的高分辨率有机碳同位素地层学：对埃迪卡拉纪-寒武纪过渡的启示
影响因子：
3.8
作者：
Guo, Qingjun;Strauss, Harald;Zhao, Fangchen
通讯作者：
Zhao, Fangchen