In:
Acta Geologica Sinica - English Edition, Wiley, Vol. 97, No. 4 ( 2023-08), p. 1150-1162
Abstract:
To better understand the Paleo‐ to Mesoproterozoic tectonic evolution of the Dabie Orogen in the northern margin of Yangtze Block, we present geochronological data for metasedimentary and metavolcanic rocks in the Huwan complex. A total of 385 detrital zircon LA‐ICP‐MS analyses for metasedimentary rocks yielded three 207 Pb/ 206 Pb age populations: 1.50–1.80 Ga, 1.81–1.87 Ga and 1.93–2.0 Ga, providing a maximum depositional timing of ca. 1.50 Ga; while metafelsic volcanic gneisses yielded protolith U‐Pb ages of 1893 ± 54 Ma. The peak ages are remarkably consistent with the tectonothermal events that occurred in the northern Yangtze Block, indicating the presence of Paleo‐ to Mesoproterozoic magmatism in the Dabie Orogen. The age range of 1.93–2.0 Ga correlates with the Paleoproterozoic collision; the age range of 1.81–1.87 Ga coincides with the period of the post‐orogenic extension; and the age range of 1.50–1.80 Ga is interpreted to associate with an extensional regime. Zircon cores with age of 1732–1965 Ma have ε Hf ( t ) values ranging from –11.70 to –2.47, indicating that juvenile crust involved in their magma sources. Owing to the similar age spectra, we proposed that the nucleus of the Dabie Orogen was close to the Yangtze Block since the Paleoproterozoic. The Huwan complex has an intimate affiliation to the Yangtze Block, and implies multiple orogenic cycles. It was not only experienced the Paleo‐Tethys ocean subduction and collision, but also recorded Paleo‐ to Mesoproterozoic tectono‐magmatic events in the Dabie Orogen.
Type of Medium:
Online Resource
ISSN:
1000-9515
,
1755-6724
DOI:
10.1111/1755-6724.15017
Language:
English
Publisher:
Wiley
Publication Date:
2023
detail.hit.zdb_id:
2420386-5
SSG:
6,25
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