气候变化领域集成服务门户(CCPortal): Continental Crustal Growth Processes Revealed by Detrital Zircon Petrochronology: Insights From Zealandia

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DOI	10.1029/2019JB019075
	Continental Crustal Growth Processes Revealed by Detrital Zircon Petrochronology: Insights From Zealandia
	Campbell M.J.; Rosenbaum G.; Allen C.M.; Spandler C.
发表日期	2020
ISSN	21699313
卷号	125 期号:8
英文摘要	Establishing spatial, temporal, and geochemical relationships between magmatism and the broader tectonics of accretionary orogens is important for understanding continental crustal growth processes. Here we reconstruct the Paleozoic and Mesozoic evolution of the active continental margin of Zealandia (eastern Gondwana), using a combination of detrital zircon geochronology, trace element geochemistry and Hf isotope data. We find that zircon grains dated 360–160 Ma from New Zealand are characterized by εHfi (+15 to +2) and trace element compositions typical of predominantly juvenile magmatic sources. In contrast, the εHfi (+15 to −5) and trace element compositions of detrital zircon grains dated 245–140 Ma from New Caledonia reflect a mix of juvenile and evolved crustal sources. Secular trends in trace element and Hf isotope compositions of zircon grains suggest that magmatism and continental crustal growth in Zealandia during the Devonian-Cretaceous were controlled by switches from trench advance to trench retreat. Orogenesis and crustal growth were controlled by a long-lived westward dipping subduction system, which during the Permian-Triassic, was intermittently affected by distinct phases of arc accretion (e.g., of the Brook Street intraoceanic arc) and orogenesis (e.g., driven by trench advance). These phases of orogenesis coincided with the Gondwanide Orogen (265–230 Ma), which might have been controlled by a plate-scale reorganization event following the final assembly of Pangea supercontinent. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Detrital zircon; Gondwana; New Caledonia; New Zealand; Petrochronology
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187661
作者单位	School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD, Australia; Central Analytical Research Facility (CARF) for Future Environments and School of Earth and Atmospheric Sciences, Queensland University of Technology, Brisbane, QLD, Australia; Geosciences, James Cook University, Townsville, QLD, Australia; Now at Department of Earth Sciences, University of AdelaideSA, Australia
推荐引用方式 GB/T 7714	Campbell M.J.,Rosenbaum G.,Allen C.M.,et al. Continental Crustal Growth Processes Revealed by Detrital Zircon Petrochronology: Insights From Zealandia[J],2020,125(8).
APA	Campbell M.J.,Rosenbaum G.,Allen C.M.,&Spandler C..(2020).Continental Crustal Growth Processes Revealed by Detrital Zircon Petrochronology: Insights From Zealandia.Journal of Geophysical Research: Solid Earth,125(8).
MLA	Campbell M.J.,et al."Continental Crustal Growth Processes Revealed by Detrital Zircon Petrochronology: Insights From Zealandia".Journal of Geophysical Research: Solid Earth 125.8(2020).