滇西马厂箐斑岩铜(钼)矿床成岩成矿时限的厘定

滇西马厂箐富碱侵入岩为一复式岩体,存在多期次岩浆侵入活动;最早岩浆活动始于52Ma,中期岩浆活动为42～47Ma,晚期岩浆活动最强烈,其时间为33～37Ma,末期岩浆活动为29～32Ma。马厂箐铜钼矿床早期成矿发生在37～40Ma左右,晚期成矿大约在34—35Ma;与区域上其它与富碱侵入岩有关矿床的形成时间相当吻合。马厂箐矿床在时、空上与矿区富碱侵入岩关系密切,其成矿作用主要与晚期的岩浆侵入活动有关。

DETERMINATION OF ORE- AND ROCK- FORMING TIME OF THE MACHANGQING PORPHYRY Cu(Mo) DEPOSIT, WESTERN YUNNAN PROVINCE

The alkali-rich intrusive rocks at Machangqing, western Yunnan Province are a composite rock massif which is characterized by multi-episodic magmatic intrusion. The earliest magma intrusive activities started at 52 Ma; the medium ones at 42-47 Ma; the late ones were most intense at 33-37 Ma; and the final-stage magmatic activities started at 29-32 Ma. The early metallogenesis of the Machangqing Cu-Mo deposit occurred at about 37-40 Ma, while the late metallogenesis occurred at about 34-35 Ma, just in consistency with the forming time of other ore deposits regionally associated with the alkali-rich intrusive rocks. The Machangqing Cu-Mo deposit is closely associated both in time and in space with the alkali-rich intrusive rocks, and its metallogenesis is related mainly to the late-stage magma intrusive activities.