Paleoproterozoic mafic dyke from Kongling terrain in the Yangtze Craton and its implication
Paleoproterozoic mafic dyke from Kongling terrain in the Yangtze Craton and its implication
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扬子克拉通崆岭地体古元古代基性岩墙及其意义
DOI：
10.1007/s11434-008-0558-0
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发表时间：
2009-03
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--
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基性岩墙是区域拉张的标志，具有重要的构造意义。扬子江空岭地体发育了大量的基性岩墙，它们与扬子江的早期演化有着重要的关系。然而，他们的年龄并没有受到很好的限制。本文报道了秦岭地体中一基性岩墙的锆石U-Pb年龄和Hf同位素组成的综合研究。锆石207Pb/206Pb加权平均年龄为1852 ± 11Ma，代表了其侵入时代。它们的δ Hf（t）值为− 6.3~0.5，加权平均值为− 3.06 ± 0.88，表明基性岩墙来自交代地幔。结果表明，扬子陆块在约400km时已进入碰撞后伸展状态。公元1850年同一时期，扬子板块表现出足够的刚性，发生脆性破裂，具有克拉通的特征。
Mafic dyke is a sign of regional extension, and thus has important tectonic significance. A great amount of mafic dykes occur in the Kongling terrain of the Yangtze Craton, which have great bearing on the early evolution of the Yangtze Craton. Their ages, however, have not been well constrained. In this paper we report an integrated study of zircon U-Pb age and Hf isotope compositions for a mafic dyke in the Kongling terrain. The zircons yielded a weighted mean207Pb/206Pb age of 1852±11Ma, which represents its intrusion age. They haveɛHf(t) values of −6.3 to 0.5, with a weighted mean of −3.06±0.88, suggesting that the mafic dyke came from metasomatic mantle. The results indicate that the Yangtze Block had transformed into post-collisional extensional regime at ca. 1850 Ma. In the same period, the Yangtze Craton shows enough rigidity to produce brittle rupture, and thus has the characteristics of a craton.
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