THE EVOLVEMENT OF MESOZOIC AND CENOZOIC MAGMA IN NORTH TIBET: The significance to geodynamic diagenetic mineralization of gold
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摘要: 藏北地区中、新生代岩浆活动强烈,成岩机制复杂.对花岗岩研究表明,区内大型岩基由成岩环境、成岩机制不同的岩石单元组成,不同岩石单元与金矿关系不同.金矿空间分布特征与岩体的空间展布密切相关.花岗岩主量元素及Sr、O同位素研究发现,随成岩时代变化,岩体成岩构造环境、物质来源、金矿化强度呈周期性(脉动性)变化规律.火山岩形成时地壳厚度变化与金成矿呈规律性变化.本区金矿成矿作用与岩浆活动之间表现出统一性和周期性变化特征.Abstract: The magmatic activity during Messozoic and Cenozoic eras in north Tibet is intense, with a complex diagenetic mechanism. Study on the granites shows that the large batholith in the area is composed of rock units of various diagenetic environment and mechanism. Each unit has defferent relations to gold deposit. The spatial distribution of gold deposits is closely related to that of the rock bodies. Based on the study of major elements and Sr and O isotope of granite, the diagenetic tectonic setting, material resources and gold mineralization of the rock bodies present periodical (pulsing) changing with the diagenetic periods. There is a regular variation between crust thickness and gold mineralization while the igneous rocks formed.
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Key words:
- magmatic evolvement /
- diagenetic environment /
- mineralization /
- gold deposit /
- north Tibet
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