Paleo-Tethys tectonic-magmatic evolution and gold-copper metallogenesis in Luang Prabang (Laos)-Loei (Thailand) metallogenic belt
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摘要: 老挝琅勃拉邦—泰国黎府成矿带位于印支板块西北缘，是中南半岛重要的金铜成矿带之一。该带经历了晚古生代—中生代古特提斯构造-岩浆演化作用，成矿活动复杂，形成了斑岩-矽卡岩型金铜矿床、浅成低温热液型金银矿床以及热液脉型金矿床。然而，热液脉型金矿的成因类型仍存在争议，3类金铜矿床与区域构造演化的关系仍缺乏总结。本文通过对前人典型矿床研究资料的整理，并结合成矿流体来源、演化新证据，将带内热液脉型金矿床的成因类型归为造山型金矿。综合区域构造-岩浆-成矿作用研究资料，总结了成矿带内3类金铜矿床的时空分布规律和成矿特征，建立了与古特提斯洋俯冲-闭合及陆陆碰撞过程相关的区域金铜成矿模式，提出了晚二叠世—早三叠世俯冲期浅成低温热液型金银矿床、早中三叠世闭合期斑岩-矽卡岩型铜金矿床、晚三叠世陆陆碰撞期造山型金矿床的成矿规律。
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关键词:
- 琅勃拉邦—黎府成矿带 /
- 古特提斯构造-岩浆演化 /
- 金铜成矿作用 /
- 造山型金矿
Abstract: The Luang Prabang (Laos)-Loei (Thailand) metallogenic belt is located on the northwestern margin of the Indochina Block and is one of the important gold-copper metallogenic belts in the Indo-China Peninsula. It has experienced the Paleo-Tethys tectonic-magmatic evolution during the Late Paleozoic-Mesozoic, leading to complex metallogenic activities and forming porphyry-skarn Cu-Au, epithermal Au-Ag, and hydrothermal vein-type gold deposits, respectively. However, the genetic type of hydrothermal vein-type gold deposits is still controversial. There is no summary as well on relationship between the three types of gold-copper deposits and the regional tectonic evolution up to now.In this paper, by summarizing the previous research data of typical deposits, and combining with new evidence from study on source and evolution of ore-forming fluids, we conclude the hydrothermal vein-type gold deposits in the belt as orogenic gold deposits. Based on regional tectonic-magmatic-metallogenic research, the temporal and spatial distribution, as well as metallogenic characteristics of three types of typical gold-copper deposit including porphyry-skarn Cu-Au deposits, epithermal Au-Ag deposits and orogenic gold deposits in the belt was summarized. We also establish a regional metallogenic model related to the subduction-closure of the Paleo-Tethys Ocean plate and subsequent continental-continental collision process, consisting of porphyry-skarn Cu-Au in Late Permian-Early Triassic subduction period, epithermal Au-Ag inEarly-Middle Triassic closure period, and orogenic Au in Late Triassic collision period. -
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