摘要:兴地Ⅱ号铜镍矿床为岩浆多期次分异、侵位形成的基性—超基性杂岩体；本文通过对兴地辉长岩进行SIMS锆石U-Pb精确测年，获得206Pb/238U加权平均年龄为737±2 Ma，该数据表明兴地Ⅱ号杂岩体形成于南华纪，并非形成于中元古代。塔里木北缘广泛发育的碳酸岩、基性—超基性岩和双峰式火山岩，为Rodinia 超大陆长期的和持续的裂解产物。
关键词: 辉长岩/
兴地Ⅱ号/
SIMS锆石U-Pb/
Rodinia超大陆
Abstract:The Xingdi No.2 complex is composed mainly of basic and partly of ultrabasic rocks. Copper and nickel mineralization occurs in both interior and exterior of the complex. A gabbro sample yielded a SIMS U-Pb zircon age of 737±2 Ma（MSWD = 0.038, 95% confidence level）, which indicates that the Xingdi complex formed during the Nanhua period rather than Mesoproterozoic time. A number of studies suggest that there were three episodes of mantleplume activities, at ca.830～800 Ma, 780～740 Ma and 650～630 Ma respecitively, during the break-up of supercontinent Rodinia within in the Tarim. The Xingdi intrusive suite formed in a Neoproterozoic continental rift setting, possibly related to mantle plume activities that led to the breakup of the Rodinia supercontinent.
Key words:Zircon SIMS U-Pb dating/
Rodinian/
Xingdi/
Kuluketage
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