摘要:
隐爆角砾岩是一种在近地表浅成或超浅成，封闭条件下隐蔽爆破作用形成的角砾状潜火山岩，在时空上与浅成—超浅成侵入或潜火山侵入体紧密伴生，其分布常常受到区域深大断裂的控制。在形成过程中伴随了多次热液流体改造，为金、银、铜、锰、铀等低温低压金属矿床的形成提供了有利条件，可作为寻找次火山岩型金、银、铜等多金属矿床的找矿标志。本次工作在珠海地区露头及井下均发现了隐爆角砾岩，其岩性主体为云英岩质隐爆角砾岩和花岗闪长岩质隐爆角砾岩，均形成燕山期，其成岩时代分别为159.8±1.7 Ma、171.74±1.11 Ma。此发现对广东地区的中生代的火山活动研究和隐爆角砾岩型多金属矿产的勘查具有重要意义。
关键词:
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珠海
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隐爆角砾岩
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火山活动
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燕山期
Abstract:
Cryptoexplosive breccia is a type of brecci-like subvolcanic or hypovolcanic rock formed by hidden explosion in shallow or super-shallow conditions, which is closely associated with shallow to ultra-shallow intrusions or hypovolcanic intrusions in space and time, and its distribution is often controlled by regional deep faults. It has undergone multiple hydrothermal fluid alteration during its formation, providing favorable conditions for the formation of low-temperature, low-pressure metal deposits such as gold, silver, copper, manganese, uranium, etc., and can be used as a prospecting marker for subvolcanic-type gold, silver, copper and other polymetallic deposits. In this study, cryptoexplosive breccia was found both in outcrop and underground in Zhuhai area. And its lithological composition mainly consisting of greisen breccia and granodiorite breccia, both of which formed during the Yanshanian period, with diagenetic ages of 159.8 ± 1.7 Ma and 171.74 ± 1.11 Ma, respectively. This discovery is of great significance for the study of Mesozoic volcanic activities and the exploration of polymetallic deposits of cryptoexplosive breccia type in Guangdong Province.
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