Archean evolution of the Bastar craton-present status
نویسندگان
چکیده
منابع مشابه
Widespread Archean basement beneath the Yangtze craton
The age distribution of the crust is a fundamental parameter in modeling continental evolution and the rate of crustal accretion through Earth’s history, but this is usually estimated from surface exposures. The exposed Yangtze craton in eastern China consists mainly of Proterozoic rocks with rare Archean outcrops. However, the U-Pb ages and Hf isotope systematics of xenocrystic zircons brought...
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15 صفحه اولThe role of serpentine in preferential craton formation in the late Archean by lithosphere underthrusting
Cratons form the cores of continents and were formed within a narrow window of time (2.5–3.2 Gy ago), the majority having remained stable ever since. Petrologic evidence suggests that the thick mantle roots underlying cratons were built by underthrusting of oceanic and arc lithosphere, but paradoxically this requires that the building blocks of cratons are weak even though cratons must have bee...
متن کاملArchean gold mineralization synchronous with the final stages of cratonization, Yilgarn Craton, Western Australia
Sm-Nd ages of pegmatite dikes that crosscut gold-bearing structures in the southern Yilgarn Craton, Western Australia, provide minimum age constraints of 2640 6 11 Ma, 2628 6 10 Ma, and 2620 6 36 Ma for gold mineralization at the Westonia and Nevoria (Yellowdine Terrane) and Scotia (Norseman Terrane) gold deposits, respectively. Similarly, a post–gold mineralization dike at Westonia has a U-Pb ...
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ژورنال
عنوان ژورنال: Proceedings of the Indian National Science Academy
سال: 2020
ISSN: 0370-0046
DOI: 10.16943/ptinsa/2020/49809