| 中国侵入岩中改造成因金矿床基本特征及成矿机制 |
| |
| 引用本文： | 王秀璋,程景平.中国侵入岩中改造成因金矿床基本特征及成矿机制[J].地球化学,1997,26(4):1-12. |
| |
| 作者姓名： | 王秀璋 程景平 |
| |
| 作者单位： | 中国科学院广州地球化学研究所 |
| |
| 摘 要： | 侵入岩中的金矿床多为改造作用形成。赋矿侵入体岩性多样，从超镁铁－镁铁到中性－酸性－碱性成分均有发现。岩体发育在克拉通、克拉通边缘活化带及褶皱带中，其时代从太古宙到燕山期都有发现。其中超镁铁岩－镁铁岩－闪长岩－碱性岩－斜长岩为上地幔或上地幔－下地壳的重熔或混染的产物，中－酸性岩为地壳深部含金火山沉积岩系重熔形成。金矿床有细脉浸染、石英脉、细脉浸染＋石英脉等类型。在大岩体中矿床发育在内接触带的断裂系中
|
| 关 键 词： | 侵入岩 金矿床 物质来源 改造成矿 成矿机制 |
CHARACTERISTICS AND GENESIS OF REWORKING DEPOSITS IN INTRUSIVE ROCKS IN CHINA |
| |
| Wang Xiuzhang Cheng Jingplng Mo Gehui Liang Huaying Xia Ping Shan Qiang.CHARACTERISTICS AND GENESIS OF REWORKING DEPOSITS IN INTRUSIVE ROCKS IN CHINA[J].Geochimica,1997,26(4):1-12. |
| |
| Authors: | Wang Xiuzhang Cheng Jingplng Mo Gehui Liang Huaying Xia Ping Shan Qiang |
| |
| Abstract: | Most of gold deposits in intrusive rocks resulted from the reworking process. The composition of ore-hosted rocks vades from ultramafic-mafic, intermediate-acid,to acidic rock. The intrusive rocks occurring in craton, acdvated zone of craton and fold zone were formed from Archean to Yanshanian pedals. It is considered dut the series of ultramafic-mafic rock, diorite, alkaline rock and anorthosite resulted fromthe anatexis or hybntdizadon of upper mande , or upper mantle-lower crust, and theacidic rock resulted from the remolding of gold-rich formadon in the lower part of the crust. The ores in the intrusive roclu consist of venial-disseminated, quartz vein and veinlet-disseminated+quartz vein. The ore bodies hosted by bigger iatnuive masses are developed along fault zones in endocontact, and those hosted by smaller intrusive masses are in the whole rock as well as in the contact zone There is a great dme gap between the formation of gold deposits and of rocks. The main formation times of gold deposits were Yanshanian period, and then Hercynian and Archean, only a few of them were formed in the Caledonian and Proterozoic times. It is considered that the ore-forming materials came from the intensive rock and gold-rich formation:and the ore-forming fluids were mainly meteoric water and formation water. The ore-forming process could be concluded as following: in the late geological event gold was leached from the intrusive rock and gold-rich formation by circulating water heated by heat cumant which came along the fault from the lower part and then ascended to the upper part and eventually the gold was precipitated due to the changing of geochemical condition. |
| |
| Keywords: | intrusive rock gold deposit time gap between rock and ores ore-forming source material reworking genesis |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
