| 华南海西—印支期成矿地质背景 |
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| 引用本文： | 陈志明.华南海西—印支期成矿地质背景[J].地质科学,1993,28(1):61-67. |
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| 作者姓名： | 陈志明 |
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| 作者单位： | 中国科学院地质研究所 北京 100029 |
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| 摘 要： | 华南海西—印支成矿期内,成矿序列完整,类型齐全,矿种繁多,为其它成矿期所莫及。沉积矿床需要稳定的地质背景,层控矿床形成的较有利的地质背景是稳中有动。
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| 关 键 词： | 成矿周期 时空分布规律 古陆 地壳活动 火山喷溢 沉积-海底喷发 |
| 收稿时间： | 1991-02-01 |
| 修稿时间： | 1991-02-01; |
GEOLOGIC BACKGROUNDS FOR METALLOGENESIS IN VARICAN-INDOSINIAN EPOCH IN SOUTH CHINA |
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| Chen Zhiming.GEOLOGIC BACKGROUNDS FOR METALLOGENESIS IN VARICAN-INDOSINIAN EPOCH IN SOUTH CHINA[J].Chinese Journal of Geology,1993,28(1):61-67. |
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| Authors: | Chen Zhiming |
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| Institution: | Institute of Geology, Academia Sinica, Beijing 100029 |
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| Abstract: | The formation of sedimentary and strata-bound mineral deposits depends on many factors. Determination of a metallogenetic epoch of mineral deposits is attributed to analysis of geologic backround for mineral deposits in a certain metallogenetic epoch.The distribution of sedimentary mineral deposits in the Variscan-Indosinian metallogenetic epoch shows a time and space regularity in South China. The sedimentary mineral deposits possess a metallogenetic sequence, from older younger. Fe→P→Mn→Al→coal →gypsuim-salt. Most of the sedimentary mineral deposits is distributed in the areas with stable crust, and most of strata-bound mineral deposits is distributed in the areas with mobile crust.The metallogenetic-geologic backgrounds for mineral deposits of various types and va- rious mineral deposits of the same type are different. The preconditions for formation of oolitic hematite deposits are the ore-forming material from source region paleogeographic conditions. The preconditions for formation of baaxite deposits are weathering dxiration and composition of the source rocks and paleoclimate.The favorable metallogenetic-geologic background for the stratabound mineral deposits is tensional faulting of the crust in a relatively stable stage. Formation of the stratabound mineraldeposits is closely related not only with sedimentary-diagenetic-epigenetic revolution ofthe sedimentary basin, but also with tectonic and magmatic activities. The "ore-forming materials of most strata-bound mineral deposits were not derived from land area, but from the deep crust or upper mantle. They have been carried firstly by volcanic extrusion and secondly by seapage of seawater and rain continuously extracting the metalls under the suitable conditions, and hence formed the metal-bearing hydrothermal solutions, which were extruded on the sea bottom through faults and cracks. |
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| Keywords: | Metallogenetic epoch Distribution law Paleoland Crustal movement Volcanic effusion Sedimentationsea floor extrusion |
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