Neoproterozoic reorganization of the Circum- Mozambique orogens and growth of megacontinent Gondwana
Neoproterozoic reorganization of the Circum- Mozambique orogens and growth of megacontinent Gondwana
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DOI：
10.1038/s43247-023-00883-6
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
Chao Wang;Xian-qing Jing;J. Meert
中科院分区：
文献类型：
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作者：
Chao Wang;Xian-qing Jing;J. Meert
新元古代冈瓦纳组合时期形成的蛇纹造山带导致了寒武纪辐射前地球动力学的变化。冈瓦纳海与莫桑比克海的闭合有关的集合细节是一个谜。通过整理已发表的地质和古地磁资料，认为塔里木地块与阿扎尼亚和阿菲夫-阿巴斯-拉萨地体有关，它们是900 ~ 650 Ma间长时间的安第斯型俯冲的场所。我们的模型表明，750-720 Ma之间的俯冲系统重组导致了莫桑比克海洋演化的两个不同阶段。870 ~ 750ma之间，莫桑比克洋扩张驱动下的南北向俯冲体系标志着洋壳消耗轨迹。从~720 Ma开始，一个新发育的~东西向俯冲系统开始吞噬莫桑比克洋，导致东冈瓦纳板块的组装。我们的新重建使用真极漂移来约束塔里木、华南和西非的相对古经度。在这种情况下，莫桑比克海洋的闭合和冈瓦纳的形成与之前的超大陆罗迪尼亚是正交的。
The serpentine orogenic belts that formed during the Neoproterozoic assembly of Gondwana resulted in geodynamic changes on the planet in advance of the Cambrian radiation. The details of Gondwana assembly associated with the closure of the Mozambique Ocean are enigmatic. We compile published geological and paleomagnetic data to argue that the Tarim block was associated with the Azania and Afif–Abas–Lhasa terranes and they were the locus of long-lived Andean-type subduction during the ~900–650 Ma interval. Our model suggests a subduction system reorganization between 750-720 Ma, which resulted in two distinct phases of Mozambique ocean evolution. Between 870-750 Ma, a N-S oriented subduction system marks the locus of ocean crust consumption driven by the extension of the Mozambique Ocean. Beginning ~720 Ma, a newly developed ~E-W oriented subduction system began to consume the Mozambique Ocean and led to the assembly of eastern Gondwana. Our new reconstruction uses true polar wander to constrain the relative paleolongitude of Tarim, South China and West Africa. In this scenario, the closure of the Mozambique Ocean and formation of Gondwana was orthogonal to the preceding supercontinent Rodinia.