The cause for Nuna breakup in the Early to Middle Mesoproterozoic
The cause for Nuna breakup in the Early to Middle Mesoproterozoic
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中元古代早中期努纳分裂的原因
DOI：
10.1016/j.precamres.2021.106287
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发表时间：
2021-08
影响因子：
3.8
通讯作者：
Shu Chutian
中科院分区：
文献类型：
--
作者：
Huang Zongying;Yuan Chao;Long Xiaoping;Zhang Yunying;Ma Xiaolong;Soldner Jeremie;Du Long;Shu Chutian
努纳超大陆（1.6-1.3 Ga）破裂的动力机制是了解地球中元古代早中期环境、生命和矿化的关键。尽管已经进行了大量研究来阐明年轻超级大陆（例如盘古大陆）的分散情况，但通过整理关键地质记录来揭示努纳分裂的驱动力的努力仍然很少。在这里，我们通过整合中亚造山带（CAOB）中国中天山（CTB）中元古界花岗岩类的新全岩地球化学数据、锆石U-Pb年龄、锆石中Hf和Nd同位素来关注这个问题。此外，还编制了中元古代早中期的全球地质资料，以进一步约束。所研究的花岗岩是 I 型花岗岩，位于约。 1480–1450 马。它们形成于 CTB 的活跃大陆边缘，该边缘曾经属于努纳边缘的芬诺斯坎迪亚。这些结果与 CTB、CAOB 和 Fennoscandia 的可用地质记录一起表明，在中元古代早期到中期，这些区域的外围存在俯冲系统。该俯冲系统在时间和空间上与努纳超大陆外围地块的 1.6–1.3 Ga 增生带相连，表明努纳超大陆周围存在一个环形俯冲系统。环绕俯冲系统伴随着间歇性的中元古代羽流岩浆活动，其中一些岩浆活动在地球化学上印有与俯冲相关的特征，表明在努纳超大陆分裂时发生了主导的连续环超大陆俯冲作用。此外，这些与地幔柱相关的间歇性岩浆活动在时间上和地球动力学上与努纳超大陆周围的外部俯冲有关。因此，我们的研究表明，外部俯冲系统的发展导致了努纳超大陆的分裂，并伴随着次级羽流活动。
The dynamic mechanism responsible for the breakup of Nuna supercontinent (1.6–1.3 Ga) is a key for understanding the early to middle Mesoproterozoic environment, life and mineralization on Earth. Although much research has been done to unravel the dispersion of young supercontinents (e.g., Pangea), efforts by sorting out critical geological records to disclose the driving force for Nuna breakup are still rare. Here we focus on this issue by integrating new whole-rock geochemical data, zircon U–Pb ages, Hf-in-zircon and Nd isotopes for Mesoproterozoic granitoids in the Chinese Central Tianshan (CTB) at the Central Asian Orogenic Belt (CAOB). Moreover, global geological data in the early to middle Mesoproterozoic are compiled to place further constraints. The studied granitoids are I-type granites emplaced at ca. 1480–1450 Ma. They were formed in an active continental margin of CTB that once belonged to the Fennoscandia in the margin of Nuna. These results, together with the available geological records in CTB, CAOB and Fennoscandia, indicate a subduction system existed along the periphery of these domains in the early to middle Mesoproterozoic. This subduction system was temporally and spatially linked to the 1.6–1.3 Ga accretionary belts in the peripheral blocks of Nuna supercontinent, suggesting an encircling subduction system surrounding Nuna supercontinent. The encircling subduction system was accompanied by intermittent Mesoproterozoic plume magmatism, some of which were geochemically overprinted with subduction-related signatures, suggesting a dominant continuous circum-supercontinent subduction operating on the breakup of Nuna supercontinent. Moreover, these episodic plume-related magmatism are temporally and geodynamically linked to the exterior subduction surrounding the Nuna supercontinent. Our study therefore demonstrates that the development of an exterior subduction system gave rise to the breakup of Nuna supercontinent, which was accompanied by subordinate plume activities.
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DOI：
--
发表时间：
2010
期刊：
Geological Science and Technology Information
影响因子：
--
作者：
Shi Wen-xiang
通讯作者：
Shi Wen-xiang
南极洲东部伊丽莎白公主地布朗山的早中元古代弧岩浆作用，随后是早新元古代麻粒岩相变质作用，具有近等压冷却路径
影响因子：
3.8
作者：
Liu Xiaochun;Wang Wei-;Zhao Yue;Liu Jian;Chen Hong;Cui Yingchun;Song Biao
通讯作者：
Song Biao
影响因子：
2.6
作者：
N. Roberts;T. Slagstad
通讯作者：
N. Roberts;T. Slagstad
影响因子：
3.7
作者：
D. Weis;B. Kieffer;C. Maerschalk;W. Pretorius;J. Barling
通讯作者：
D. Weis;B. Kieffer;C. Maerschalk;W. Pretorius;J. Barling
影响因子：
3.8
作者：
H. Hrushikesh;N. Prabhakar;A. Bhattacharya
通讯作者：
H. Hrushikesh;N. Prabhakar;A. Bhattacharya