| 两广云开区震旦纪硅岩建造的岩石学特征及成因 |
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| 引用本文： | 周慧杰,吴丰元,吴家勇. 两广云开区震旦纪硅岩建造的岩石学特征及成因[J]. 广西师范学院学报(自然科学版), 1999, 0(3) |
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| 作者姓名： | 周慧杰 吴丰元 吴家勇 |
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| 作者单位： | 广西师范学院地理系!南宁市，530001，海南省地矿局!海口，571158，广东省廉江银矿!廉江，528300 |
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| 摘 要： | 地处粤西和桂东南的云开地区前寒武系顶部的硅岩沉积建造（“震旦系Ｄ 组”），具有层状、纹理状、块状和假角砾状构造。其中的元素显著地贫ＴｉＯ２ 和Ａｌ２Ｏ３， 大部分微量元素相对于地壳克拉克值亏损， 但Ｂａ、Ｓｂ、Ｈｇ、Ａｇ 和Ｂｉ等少数几种元素例外地富集； 在Ａｌ－ Ｆｅ－ Ｍｎ 三元图中投影落在热水沉积区域； 以ＲＥＥ总量低为特征， 平均稀土元素分布型式落在世界上已知典型热水沉积物的上、下限之间。上述特征说明， 该硅岩建造是典型的热水沉积成因产物。
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| 关 键 词： | 层状硅岩建造 岩石学特征 热水沉积 云开地区 |
PETROLOGICAL FEATURE OF THE SINIAN CHERT FORMATON AND ORIGIN IN YUNKAI AREA, GUANGXI AND GUANGDONG |
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| ZHOU Huijie WU Fengyuan WU Jiayong. PETROLOGICAL FEATURE OF THE SINIAN CHERT FORMATON AND ORIGIN IN YUNKAI AREA, GUANGXI AND GUANGDONG[J]. Journal of Guangxi Teachers Education University:Natural Science Edition, 1999, 0(3) |
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| Authors: | ZHOU Huijie WU Fengyuan WU Jiayong |
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| Affiliation: | 1.Geography Department of Guangxi Teachers College; 2.Bureau of Geology and Mineral Resources of Hainan; 3.Lianjiang Silver Deposit of Guangdong |
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| Abstract: | The Sedimentary chert formation (Sinian D fromation) at the top of the Precambrian in Yunkai area,western Guangdong and southeastern Guangxi displays banded,lamellated,massive and pseudobrecciated structures.This formation is poor in TiO 2 and Al 2O 3 with most of the trace elements depleted in relation to their clarke values,although a few including Ba,Sb,Hg,Ag and Bi are exceptionally enriched;in Al-Fe-Mn triangular diagram,the sample points fall into the hydrothermal sedimentary field;total REE is characterized by low value and the average REE distribution pattern conforms with those of the worlds typical hydrothermal sediments.All these features are indicative of a typical hydrothermal derivation. |
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| Keywords: | bedded chert formation petrological feature hydrothermal sedimentary Yunkai area |
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