地质学
地质年代学
深成岩体
克拉通
岩石成因
俯冲
地球化学
纤维接头
构造学
早三叠世
古生物学
二叠纪
地幔(地质学)
医学
解剖
构造盆地
作者
Changlin Shi,Xiaozhong Ding,Xiaodong Zhou,Lanshi Nie,Jibiao Zhang
标识
DOI:10.1111/1755-6724.14906
摘要
Abstract The Changchun–Yanji suture zone (CYSZ) in NE China is considered as the suture between the North China Craton (NCC) and Central Asian Orogenic Belt (CAOB). The geochronology, geochemistry and Sr‐Nd‐Hf isotopes of Early–Middle Triassic adakitic plutions from the CYSZ, are presented in this paper to discuss their petrogenesis and tectonic setting, as well as to constrain the timing and style of the Paleo‐Asian Ocean's final closure. In Early Triassic, the Dayushan pluton (ca. 250 Ma) from western CYSZ has negative ε Nd ( t ) values, bidirectional provenances (NCC and CAOB) of ε Hf ( t ), which are formed in a collision tectonic setting. In contrast, in eastern CYSZ, the early Triassic samples in Liangshan (ca. 242 Ma) were high Mg # values, positive ε Nd ( t ), single provenances (CAOB) of ε Hf ( t ) resulting from a subduction setting. In the Middle Triassic, the A‐type granites in western CYSZ are found in previous studies representing a post‐collisional extensional environment, whereas syn‐collisional Lianyanfeng granites (ca. 237 Ma) in eastern CYSZ with low I Sr and large scale ε Nd ( t ) and ε Hf ( t ) values from bidirectional provenances (NCC and CAOB), represent a collisional setting. The Paleo‐Asian Ocean's occurred in a scissor‐like fashion along the CYSZ during the Triassic period.
科研通智能强力驱动
Strongly Powered by AbleSci AI