| 陈森煌.关于我国超基性岩含铬性评价探讨[J].地质找矿论丛,1986,(4):16-26 |
| 关于我国超基性岩含铬性评价探讨 |
| THE EVALUATION CRITERIA FOR Cr-MI-NERALIZATION OF ULTRABASIC ROCKS IN CHINA |
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| DOI：10.6053/j.issn.1001-1412.1986.4. 002 |
| 中文关键词: |
| 英文关键词: |
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| 中文摘要: |
| 铬铁矿的找矿和研究工作有三个相互联系的环节,即在有利构造部位寻找超基性岩带(蛇绿岩带),圈定其中的超镁铁岩体;评价岩带和岩体的含铬性,选择铬铁矿找矿靶区;在含矿岩体中普查勘探工业铬铁矿矿床.我国近三十年来的铬矿找矿工作,对解决第1、3环节问题,已在实践和方法上积累了丰富经验:关键是如何从大量岩带(体)中判别具有成矿远景的岩带(体),建立起—套简易而有效的评价超基性岩含铬性的准则. |
| 英文摘要: |
| The formation of chromite deposits is related with a series of magma-tec tonic events in the upper mantle and the crust of the Earth. Thus, the heterogeneity of magmatic activities and tectonics may be regarded as the main criteria for the evaluation of chrome mineralization in ultrabasic rocks.The chromium-bearing ultrabasic rocks in China can be divided into two types: one is the ophiolitic ultramafic rocks distributed in the suture lines; the other is zonal mafic-ultramafic rocks distributed in the margin fault zones of plateforms.Massive chromite deposits (HCR or HAL) occurred mainly in the ophiolitic rocks and disseminated chromite deposits (HFE) occurred mainly in the zonal uhramafic rocks are different in composition, but they are all closely associated with the Mg-rich rock facies in the two rock series.The main marks to evaluate the potentiality of chrome mineralization of ultrabasic rocks are as follows: the favourable tectonic position in the junction boundary of two geotectonic units; a series of ultramafic Mg-rich facies with high chromium and apparent difference of composition; well-developed, late cog nate basic-ultrabasic dykes; and strong geophysical-geochemical field anomalies. |
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