GEOCHEMICAL CHARACTERISTICS OF MIDDLE CAMBRIAN-EARLY ORDOVICIAN LIMESTONE AND PALEO-OCEAN RECONSTRUCTION BASED ON δ18OSMOW, 87Sr/86Sr AND RARE EARTH ELEMENTS, TARIM BASIN

CHEN Yongquan; ZHOU Xinyuan

doi:10.3724/SP.J.1140.2009.01047

2009 Vol. 29, No. 1

Article Contents

Article navigation > Marine Geology & Quaternary Geology > 2009 > 29(1): 47-52

Next Article Previous Article

CHEN Yongquan, ZHOU Xinyuan. GEOCHEMICAL CHARACTERISTICS OF MIDDLE CAMBRIAN-EARLY ORDOVICIAN LIMESTONE AND PALEO-OCEAN RECONSTRUCTION BASED ON δ18OSMOW, 87Sr/86Sr AND RARE EARTH ELEMENTS, TARIM BASIN[J]. Marine Geology & Quaternary Geology, 2009, 29(1): 47-52. doi: 10.3724/SP.J.1140.2009.01047

Citation:

CHEN Yongquan, ZHOU Xinyuan. GEOCHEMICAL CHARACTERISTICS OF MIDDLE CAMBRIAN-EARLY ORDOVICIAN LIMESTONE AND PALEO-OCEAN RECONSTRUCTION BASED ON δ18OSMOW, 87Sr/86Sr AND RARE EARTH ELEMENTS, TARIM BASIN[J]. Marine Geology & Quaternary Geology, 2009, 29(1): 47-52. doi: 10.3724/SP.J.1140.2009.01047

GEOCHEMICAL CHARACTERISTICS OF MIDDLE CAMBRIAN-EARLY ORDOVICIAN LIMESTONE AND PALEO-OCEAN RECONSTRUCTION BASED ON δ18OSMOW, 87Sr/86Sr AND RARE EARTH ELEMENTS, TARIM BASIN

Tarim Oil Field Company Exploration and Development Research Institute, Korla 841000, China

Received Date: 10 September 2008

Revised Date: 28 December 2008

Abstract

Abstract

In the middle Cambrian to lower Ordovician of Tarim Basin, occurs a little limestone, which is the studied object in this research, aimed at seawater geochemical reconstruction. Geochemical results showed that a linear correlation was demonstrated between the oxygen isotope values and the MgO% content, which indicates that dolomitization will lead to higher oxygen isotope values. The intercept of the line on the δ18O axis is -8.6‰, representing the oxygen isotope value of original limstones, and the oxygen isotope value of paleo-seawater can be calculated with value of -8.9‰. The average 87Sr/86Sr value is 0.708 918, which can be considered as the value of paleo-seawater. In the PAAS-normalized Rare Earth Elements diagram, LREE-enriched pattern can be seen in the studied limstones, which might represent the REE characteristics of paleo-seawater.
- δ¹⁸O /
- ⁸⁷Sr/⁸⁶Sr /
- rare earth elements /
- Tarim Basin /

FullText(HTML)

References

[1]	黄思静,QING H,胡作维, 等. 四川盆地东北部三叠系飞仙关组碳酸盐岩成岩作用和白云岩成因的研究现状和存在问题[J]。地球科学进展,2007,22(5):495-503. Google Scholar [HUANG Sijing, QING H, HU Zuowei, et al. The diagenesis and dolomitization of the Feixianguan Carbonates of Triassic in NE Sichuan Basin:An overview[J]. Advances in Earth Science,2007,22(5):495-503.] Google Scholar
[2]	Warren J. Dolomite:occurrence, evolution and economically important associations[J]. Earth-Science Reviews, 2000, 52:1-81. Google Scholar
[3]	Gasparrini M. Massive hydrothermal dolomites in the southwestern Cantabrian Zone (Spain) and their relation to the Late Variscan evolution[J]. Marine and Petroleum Geology, 2006,23:543-568. Google Scholar
[4]	沈昭国,陈永武,郭建华. 塔里木盆地下古生界白云石化成因机理及模式探讨[J]. 新疆石油地质,1995,16(4):319-324. Google Scholar [SHEN Zhaoguo, CHEN Yongwu, GUO Jianhua. The genetic mechanism and models of dolomitization in Lower Paleozoic, Tarim Basin[J]. Xinjiang Petroleum Geology, 1995, 16(4):319-324.] Google Scholar
[5]	顾家裕. 塔里木盆地下奥陶统白云岩特征及成因[J]. 新疆石油地质,2000,21(2):120-122. Google Scholar [GU Jiayu. Characteristics and genesis of dolostones occurring in Lower Ordovician, Tarim Basin[J]. Xinjiang Petroleum Geology, 2000,21(2):120-122.] Google Scholar
[6]	陈永权,周新源,赵葵东, 等. 塔里木盆地塔中1井藻纹层白云岩与竹叶状白云岩成因-基于岩石学、元素与同位素地球化学的厘定[J]. 地质学报,2008,82(6):826-834. Google Scholar [CHEN Yongquan, ZHOU Xinyuan, ZHAO Kuidong, et al. Geochemical research on straticulate dolostone and spatulate dolostone in Lower Ordovician strata of Tazhong1 well, Tarim Basin[J]. Acta Geologica Sinica, 2008,82(6):826-834.] Google Scholar
[7]	陈永权,周新源,赵葵东, 等. 塔里木盆地中寒武统泥晶白云岩红层的地球化学特征与成因探讨[J]. 高校地质学报,2008,14(4):283-294. Google Scholar [CHEN Yongquan, ZHOU Xinyuan, ZHAO Kuidong, et al. Geochemical research on middle Cambrian supratidal red dolostones in Tarim Basin:Implications for dolostone genesis[J]. Geological Journal of China Universities, 2008,14(4):283-294.] Google Scholar
[8]	濮巍,高剑峰,赵葵东,等. 利用HIBA和BCTA快速分离Sm-Nd、Rb-Sr方法[J].南京大学学报,2005.41(4),445-450. Google Scholar [PU Wei, GAO Jianfeng, ZHAO Kuidong, et al. Separation method of Rb-Sr, Sm-Nd using DCTA and HIBA[J]. Journal of Nanjing University (Natural Sciences), 2005, 41(4):445-450.] Google Scholar
[9]	李铁刚, 孙荣涛, 张德玉. 晚第四纪对马暖流的演化和变动:浮游有孔虫和氧碳同位素证据[J]. 中国科学D辑,2007,37(5):660-669. Google Scholar [LI Tiegang, SUN Rongtao, ZHANG Deyu. The effect of late Quaternary on the evolution and the variations of seawater current:oxygen and carbon evidence of foraminifer[J]. Science in China (Series D), 2007,37(5):660-669.] Google Scholar
[10]	Chen Y Q, Jiang S Y, Ling H F, et al. Isotopic compositions of small shelly fossil anabarites from low Cambrian in Yangtze platform of South China:implications for palaeocean temperature[J]. Progress in Natural Science, 2007, 17(10):1185-1191. Google Scholar
[11]	Kaufman A J, Jacobsen S B, Knoll A H. The Vendian record of Sr and C isotopic variations in seawater:implications for tectonics and paleoclimate[J]. Earth Planet. Sci. Lett., 1993, 120:409-430. Google Scholar
[12]	Kaufman A J, Knoll A H. Neoproterozoic variations in the C-isotopic composition of seawater:stratigraphic and biogeochemical implications[J]. Precambrian Res.,1995, 73:27-49. Google Scholar
[13]	Coplen T B, Kendall C, Hopple J. Comparison of stable isotope reference samples[J]. Nature, 1983, 302:236-238. Google Scholar
[14]	Banner J L, Hanson G N. Calculation of simultaneous isotopic and trace element variations during water-rock interaction with application to carbonate diagenesis[J]. Geochim. Cosmochim. Acta, 1990, 54:3132-3138. Google Scholar
[15]	Veizer J, Ala D, Azmy K,et al. ⁸⁷Sr/⁸⁶Sr, δ¹³C and δ¹⁸O evolution of Phanerozoic seawater[J]. Chemical Geology, 1999, 161:59-88. Google Scholar
[16]	陈永权,蒋少涌,凌洪飞,等.华南寒武纪海洋中的沉积矿床及其古环境[J]. 海洋地质与第四纪地质, 2005, 25(1):79-84. Google Scholar [CHEN Yongquan, JIANG Shaoyong, LING Hongfei, et al. Sedimentary ore deposits in Cambrian ocean of the south China and the paleo-ocean environments[J]. Marine Geology and Quaternary Geology, 2005, 25(1):79-84.] Google Scholar
[17]	孟宪伟,杜德文,程振波. 冲绳海槽有孔虫壳体的微量元素Sr, Nd同位素地球化学[J].海洋学报,2001,23(2):62-68. Google Scholar [MENG Xianwei, DU Dewen, CHENG Zhenbo. Trace elemental and Sr-Nd isotopic geochemistry of foraminifera shell of the Okinawa Trough[J]. Acta Oceanologica Sinica,2001,23(2):62-68.] Google Scholar
[18]	张沛,郑建平,张瑞生,等. 塔里木盆地塔北隆起奥陶系-侏罗系泥岩稀土元素地球化学特征[J]. 沉积学报, 2005, 23(4):740-746. Google Scholar [ZHANG Pei, ZHENG Jianping, ZHANG Ruisheng, et al. Rare earth elements characteristics of Ordovician-Jurassic mudstones in Tabei uplift, Tarim Basin[J]. Acta Sedimentologica Sinica, 2005, 23(4):740-746.] Google Scholar