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Seismological constraints on the crustal structures generated by continental rejuvenation in northeastern China

机译:东北大陆回生产生的地壳结构的地震学约束

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摘要

Crustal rejuvenation is a key process that has shaped the characteristics of current continental structures and components in tectonic active continental regions. Geological and geochemical observations have provided insights into crustal rejuvenation, although the crustal structural fabrics have not been well constrained. Here, we present a seismic image across the North China Craton (NCC) and Central Asian Orogenic Belt (CAOB) using a velocity structure imaging technique for receiver functions from a dense array. The crustal evolution of the eastern NCC was delineated during the Mesozoic by a dominant low seismic wave velocity with velocity inversion, a relatively shallow Moho discontinuity, and a Moho offset beneath the Tanlu Fault Zone. The imaged structures and geochemical evidence, including changes in the components and ages of continental crusts and significant continental crustal growth during the Mesozoic, provide insight into the rejuvenation processes of the evolving crust in the eastern NCC caused by structural, magmatic and metamorphic processes in an extensional setting. The fossil structural fabric of the convergent boundary in the eastern CAOB indicates that the back-arc action of the Paleo-Pacific Plate subduction did not reach the hinterland of Asia.
机译:地壳振兴是一个关键过程,它塑造了构造活跃大陆地区当前大陆结构和成分的特征。地质和地球化学观测提供了有关地壳振兴的见解,尽管地壳结构纤维没有受到很好的限制。在这里,我们使用速度结构成像技术,通过密集阵列接收器功能,展示了华北克拉通(NCC)和中亚造山带(CAOB)上的地震图像。在中生代,东NCC的地壳演化由低速地震波主导,具有速度反演,相对较浅的莫霍面不连续性和Tan庐断裂带下方的莫霍面偏移。成像的结构和地球化学证据,包括中生代期间大陆壳成分和年龄的变化以及大陆壳的显着增长,提供了对NCC东部地壳演化的振兴过程的洞察力,该新生壳是由构造,岩浆和变质作用引起的。扩展设置。 CAOB东部收敛边界的化石结构构造表明,古太平洋板块俯冲的后弧作用没有到达亚洲腹地。

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