| 阿尔泰大型-超大型矿床富集区地壳演化 |
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| 引用本文：李红阳,杨竹森,罗泰义,高振敏,王登红.1999.阿尔泰大型-超大型矿床富集区地壳演化[J].地球学报,20(4):409-417. |
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| 基金项目:国家三Ο五项目,阿尔泰地区成矿规律与成矿系列研究阶段成果 |
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| 中文摘要:通过构造、岩浆、变质、成矿等地质作用及其时空演化规律的对比分析,以及物探重力、航磁及遥感信息的综合研究,认为古生代阿尔泰富蕴地幔热柱成因的三联点裂谷形成与演化———“手风琴式”开合,是阿尔泰大型- 超大型矿床富集区形成与演化的根本原因。地幔热柱热地幔物质大规模上涌和横向扩张,产生三联点裂谷系统,导致古大陆解体,形成阿尔泰“洋岛型”蛇绿岩、阿尔泰型花岗岩、花岗岩化、高温低压变质带和主要大型- 超大型矿床;地幔热柱活动停止或间息,导致三联点裂谷系统发生A 型俯冲而封闭造山,形成三叉式陆间造山带和同造山花岗岩、中高压变质带及部分矿藏。 |
| 中文关键词:地幔热柱 三联点裂谷 大陆解体 大型-超大型矿床富集区 新疆阿尔泰 |
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| Crustal Evolution of Altay Large-Superlarge Deposits Enriched Region in Xinjiang |
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| Abstract:On the basis of comprehensive studies of various sorts of information such as tectonism, magmatism,metamorphism, ore-forming processes with their evolution in space and time, and geophysics, the formation and evolution(three accordion opening-closing events) of Altay large-superlarge deposits enriched region are considered to have been caused by the inception and evolution of Paleozoic Altay mantle plume-generated triple junction rifts. Ascending and lateral spreading of the mantle plume opened the triple junction rifts, resulted in the continental break-up, and generated Altay "ocean island-type" ophiolites, Altay-type granitoids, granitization, high-temperature and low-pressure metamorphic belts and chief large-superlarge deposits in the enriched region. Subsiding or resting of the mantle plume caused the A-type subduction, closing and orogeny of the triple junction rift system, and yielded triple-type intracontinental orogenic belts, synorogenic granitoids and some mineral deposits. |
| keywords:mantle plume triple junction rift continental break-up large-superlarge deposits enriched region Altay |
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