Zara-Bolucan地区（土耳其）周围始新世地层的古沉积环境及生物标志特征

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Zara-Bolucan地区（土耳其）周围始新世地层的古沉积环境及生物标志特征

Ager,2018, 2(3): 237-244

原文网址：http://www.astp-agr.com/index.php/Index/Index/detail?id=68

  利用如气相色谱(GC)和气相色谱-质谱(GC-MS)分析等详细的有机地球化学方法，确定了锡瓦斯盆地东北部Zara-Bolucan地区始新世沉积物的生物标志特征和古沉积条件。在锡瓦斯盆地东北部的研究区，始新世Bozbel和Kozluca组由富含有机质的沉积岩组成，这些沉积岩在水进-退积循环中沉积。在利用生物标志物资料评价古环境特征时，使用了与正构烷烃、异戊二烯类、萜类和甾体类化合物有关的数据。特别是用C23三环/C30藿烷、C26/C25三环萜烷、同型Hopane/C30藿烷和非正构烷/规则甾烷数据所表征的海洋环境特征。Pr/Ph、Pr/n-C17和Ph/n-C18比值表明，在还原环境条件下，海洋有机质以沉淀为主。

在所研究的样品中，藻类细菌有机质的贡献被认为是由于C23三环萜对C24的优越性以及比C24三环萜大的缘故。然而，伽马切烷指数表明，最初存在着一个低盐度的环境。陆生有机质的重要贡献是由类异戊二烯和生物标志物比率来表示的， n-c29、n-C31、CPI、焦油值、n-C19/n-C31、C27-C28-C29等正构烷烃的相对丰度较高。通过异戊烯和正烷烃的比值和Tm/Ts，C29Ts/C29的藿烷比，确定了准厌氧至厌氧的古沉积条件。

Biological marker indicators of paleo-depositional environment for the Eocene formations around Zara-Bolucan region (central anatolia, Turkey)

Nazan Yalcin Erik

(Published: 2018-06-02)

CorrespondingAuthor and Email: Nazan Yalcin Erik, nyalcin@gmail.com

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Citation: Yalcin Erik, N. Biological marker indicators of paleo-depositional environment for the Eocene formations around Zara-Bolucan region (central anatolia, Turkey). Advances in Geo-Energy Research, 2018, 2(3): 237-244, doi: 10.26804/ager.2018.03.02.

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ArticleType: Original article

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Abstract：

    Biological marker (biomarker) characteristics and paleo-depositional conditions of Eocene sediments around Zara-Bolucan northeast of Sivas Basin have been determined by means of detail organic geochemical studies such as gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) analysis. In the investigated area, northeast section of the Sivas Basin, the Eocene Bozbel and Kozluca Formations consist of a organic matter rich sedimentary rocks deposited within trangressive-regressive cycles. During the evaluation of paleoenvironment characteristics with biomarker data, data related to n-alkanes, isoprenoids, terpenoids and steroids were used. Especially, the marine environment features indicated by C23 tricyclic/C30 hopane, the C26 /C25 tricyclic terpanes, homohopane/C30 hopane and diasterane/regular sterane data. The ratios of Pr/Ph, Pr/n-C17 and Ph/n-C18 indicate that there is marine organic matter predominantly precipitated under reducing environmental conditions. In the studied samples, the algal-bacterial organic matter contribution was interpreted to be due to the superiority of the C23 tricyclic terpene to C24 , as well as larger than the C24 tricyclic terpane. However, the gammacerane index suggests that there is initially a low salinity environment. The significant terrestrial organic matter contribution is indicated by the isoprenoid and biomarker ratios, dominance of higher n-alkanes such as n-C29 , n-C31 , CPI, TAR values, n-C19 /n-C31, relative abundance of C27-C28-C29 regular steranes. Suboxic to anoxic palo-depositional conditions are confired by the isoprenoid and n-alkane ratios and T m /T s , C 29 T s /C 29 hopane ratios.

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Keywords: Sivas Basin, organic geochemistry, biomarkers, Zara, Eocene, paleo-environment.