Geochemical characteristics of trace elements in limestone of the Neoproterozoic Wangshan Formation in northern Anhui Province

doi:10.7605/gdlxb.2012.06.012

Abstract

Abstract:

To understand the geochemical characteristics of limestone from the Neoproterozoic Wangshan Formation and its geological background， petrological and trace elemental analyses had been carried out for the limestone collected from the Neoproterozoic Wangshan Formation in northern Anhui Province.The results showed that: the elements of U，Pb，Sr，Sm in the limestone are rich，while Nb，Pr，Zr，Hf arepoor; the REE in limestone from the Wangshan Formation are characterized by the lower total REE(6.68～42.78 μg/g)，light LREE depletion(Nd_SN/Yb_SN=0.65～0.91)，slight fractionation between LREE and HREE，and various degree in positive La and Y anomaly.It can be inferred that the ancient seawater is anoxic and high salinity，and the palaeoclimate is drought by the information from U，Th，V，Sr/Ba and Sr/Cu，respectively.The limestone from the Wangshan Formation might be deposited in the continental arc environment indicated by diagrams of the La-Th-Sc and Th-Sc-Zr/10.

Key words: Wangshan Formation, limestone, trace element, depositional environment, northern Anhui Province

摘要：

为研究皖北新元古界望山组灰岩地球化学特征及地质背景，对该地区灰岩进行了系统的岩石学和微量元素地球化学测试。研究结果表明：望山组灰岩中，元素U、Pb、Sr、Sm富集，Nb、Pr、Zr、Hf明显亏损；稀土总量偏低（6.68～42.78 μg/g），轻稀土略亏损，Nd_SN/Yb_SN值在0.65～0.91之间变化，轻重稀土分异微弱，灰岩样品均具有程度不同的La和Y正异常。U、Th、Ce等元素特征反映了研究区望山组形成于缺氧的水体环境，Sr/Ba、Sr/Cu值反映了望山组灰岩形成于盐度较大的海水环境和干旱的气候条件；La-Th-Sc和Th-Sc-Zr/10图解指示望山组灰岩可能形成于大陆岛弧环境。

关键词: 望山组, 灰岩, 微量元素, 沉积环境, 皖北

CLC Number:

P512.2

Chen Song, Fu Xuehai, Gui Herong, Sun Linhua. Geochemical characteristics of trace elements in limestone of the Neoproterozoic Wangshan Formation in northern Anhui Province[J]. JOURNAL OF PALAEOGEOGRAPHY, 2012, 14(6): 813-820.

陈松, 傅雪海, 桂和荣, 孙林华. 皖北新元古界望山组灰岩微量元素地球化学特征^*[J]. 古地理学报, 2012, 14(6): 813-820.

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URL: http://www.gdlxb.cn/EN/10.7605/gdlxb.2012.06.012

http://www.gdlxb.cn/EN/Y2012/V14/I6/813

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