甘肃省东部中川岩体内外带铀金成矿规律及其找矿判据

中川岩体是以印支期花岗岩为主体,呈岩基产出的近等轴状复式岩体,在其内外带已查明铀矿床3处、金矿床5处、铀、金矿(化)点数十处.通过讨论这些铀、金矿床的成矿条件、分布规律、形成机制以及这些矿床的定位判据,揭示它们的内在联系.认为中川铀、金矿田铀、金成矿规律既有其共性,又有截然不同的个性.整个成矿过程都是在区域隆起上升的地质背景下进行的,但金成矿遵循内生热液成矿机制,铀矿则主要遵循外生成矿机制.

U-Au metallogenic pattern and prospecting criteria inside and outside zone of Zhongchuan rock mass in East Gansu Province

Zhongchuan rock mass is an approximately equiaxed complex batholith body, which is mainly composed of granite in Indo-Chinese stage. 3 U-deposits, 5 Au-deposits and several dozen mineralized spots have been discovered within internal and external zone. By studying the occurrence, distribution pattern and forming mechanism, the internal relationship between them and location indicators of those deposits was revealed. It is proposed that the whole ore-forming course of Zhongchuan U-Au deposits field is in the geological setting of regional uplift, Au mineralization is the result of endogenic hydrothermal metallogenetic mechanism, and U mineraliztion is the result of exogene metallogenetic mechanism.