REE Geochemical Characteristics and Their Geological Signification in Silurian,West of Hunan Province and North of Guizhou Province

Abstract

Abstract:

The sediments of Silurian in South China are main detrital rocks, which were formed at the end of Caledonian. A set of high quality source rocks developed at the bottom of Silurian. It has an important signification to reveal the palaeoenvironment and tectonic setting for this sequence. The systemic analysis of geochemistry indicates that the amount of REE of Silurian in West of Hunan Province and North of Guizhou Province is high. The ratios of LREE/HREE and LaN/YbN show that the differentiation of LREE and HREE is obvious. The REE distribution patterns are characterized by rich in LREE and obviously negative Eu abnormity. The Ce_anom can be used to reveal redox of palaeo-ocean. The reduction in Early Silurian is strong with high Ce_anom, which is advantageous for organic preservation and the formation of good quality source rocks. The differential degree of REE can also be used to reflect the sedimentary rates. The Lan/Ybn values decrease gradually from bottom to top in Silurian. The sedimentary rate at the bottom of Silurian is lower than that of upper sequence, so it is more favorable for organic accumulation and preservation. According to the characteristics of REE and their ratios, combined with achievements in palaeogeography, it can be drawn that provenance of the study area comes from Xuefeng and Qianzhong palaeouplifts, and the source rocks are granites and sedimentary rocks.

Key words: Silurian, REE, geochemistry, palaeo-environment, provenance

CLC Number:

P618.7

LI Shuang-jian, XIAO Kai-hua, WO Yu-jin, LONG Sheng-xiang, CAI Li-guo. REE Geochemical Characteristics and Their Geological Signification in Silurian,West of Hunan Province and North of Guizhou Province[J]. Geoscience, 2008, 22(2): 273-280.

References

\[1\]Taylor S R, McLennan S M. The Continental Crust: Its Composition and Evolution \[M\]. Oxford: Blackwell, 1985.
\[2\]Bhatia M R. Rare earth elements geochemistry of Australian Paleozoic graywacks and mudstones: provenance and tectonic control \[J\]. Sedimentary Geology, 1985,45(12）：97-113.
\[3\]Roser B P, Korsch R J. Provenance signatures of sandstonemudstone suites determined using discriminant function analysis of major element data \[J\]. Chemical Geology, 1988, 67(3）: 119-139.
\[4\]McLennan S M. Rare earth elements in sedimentary rocks: influence of provenance and sedimentary processes \[J\]. Reviews in Mineralogy, 1989, 21(1）: 169-200.
\[5\]Condie K C. Another look at rare earth elements in shales \[J\]. Geochimica et Cosmochimica Acta, 1991, 55(9）: 2527-2531.
\[6\]于炳松,陈建强,李兴武,等.塔里木盆地肖尔布拉克剖面下寒武统底部硅质岩微量元素和稀土元素地球化学及其沉积背景\[J\].沉积学报, 2004,22(1）:59-66.
\[7\]刘士林，刘蕴华，林舸,等.渤海湾盆地南堡凹陷新近系泥岩稀土元素地球化学特征及其地质意义\[J\].现代地质, 2006, 20(3）: 449-456.
\[8\]刘俊海,杨香华,于水，等.东海盆地丽水凹陷古新统沉积岩的稀土元素地球化学特征\[J\].现代地质,2003,17(4）:421-427.
\[9\]汪啸风，柴之芳.奥陶系与志留系界线处生物绝灭事件及其与铱和碳同位素异常的关系\[J\]. 地质学报, 1989,63（3）:255-264.
\[10\]王成源, 列·杰普森. 杰普森大洋模式及其在华南志留纪的应用\[J\].微体古生物学报, 1994, 11(1）:71-85.
\[11\]张廷山,俞剑华,边立曾,等. 四川盆地南北缘志留系的锶和碳、氧同位素演化及其地质意义\[J\]. 岩相古地理, 1998, 18(3）:41-49.
\[12\]周名魁,王汝植,李志明.中国南方奥陶—志留纪岩相古地理与成矿作用\[M\]．北京：地质出版社,1993.
\[13\]文玲,胡书毅，田海芹. 扬子地区志留纪岩相古地理与石油地质条件研究\[J\].石油勘探与开发,2002, 29(6）:11-14.
\[14\]Shields G, Stille P. Diagenetic constrains on the use of cerium anomalies as paleoseawater redox proxies：An isotopic and REE study of Cambrian phosphofites\[J\]．Chemical Geology, 2001, 175(1-2）: 29-48.
\[15\]Elderfield H, Greaves M J. The rare earth elements in seawater \[J\]．Nature, 1982, 296(18）: 214-219.
\[16\]腾格尔,刘文汇,徐永昌,等.高演化海相碳酸盐烃源岩地球化学综合判识——以鄂尔多斯盆地为例\[J\].中国科学(D辑）, 2006, 36(2）:167-176.
\[17\]McLennan S M, Hemming S R, Taylor S R, et a1. Early Proterozoic crustal evolution: geochemical and NdPb isotopic evidence from metasedimentary rocks, southwestern North American\[J\]. Geochimica et Cosmochimica Acta, 1995, 59(6）: 1153-1177．
\[18\]柏道远,黄建中,马铁球,等.湘东南志留纪彭公庙花岗岩体的地质地球化学特征及其构造环境\[J\].现代地质,2006,20(1）:129-140.第22卷第2期

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