Tectonic subdivision of Dabie orogenic belt, central China: Evidence from Pb isotope geochemistry of late Mesozoic basalts

2002 ◽  
Vol 21 (2) ◽  
pp. 147-155 ◽  
Author(s):  
Kuang Shaoping ◽  
Zhang Benren
Keyword(s):  
Isotope Geochemistry ◽  
Orogenic Belt ◽  
Central China ◽  
Pb Isotope ◽  
Late Mesozoic ◽  
Dabie Orogenic Belt

Pb Isotope Mapping in the Tongbai-Dabie Orogenic Belt, Central China

2010 ◽  
Vol 82 (1) ◽  
pp. 126-133 ◽  
Author(s):  
ZHANG Li ◽  
ZHONG Zengqiu ◽  
WANG Linsen ◽  
Zhang Benren
Keyword(s):  
Orogenic Belt ◽  
Central China ◽  
Pb Isotope ◽  
Dabie Orogenic Belt

Petrogenesis and tectonic implications of A-type granites in the Dabie orogenic belt, China: geochronological and geochemical constraints

2009 ◽  
Vol 146 (5) ◽  
pp. 638-651 ◽  
Author(s):  
LING CHEN ◽  
CHANG-QIAN MA ◽  
ZHEN-BING SHE ◽  
ROGER MASON ◽  
JIN-YANG ZHANG ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
Eastern China ◽  
Volcanic Rocks ◽  
Orogenic Belt ◽  
The Body ◽  
Geochemical Data ◽  
Late Mesozoic ◽  
The North ◽  
Dabie Orogenic Belt ◽  
Type Granite

AbstractThe Dabie orogenic belt is characterized by the presence of large volumes of intrusive and volcanic rocks that formed in Late Mesozoic times. Most of the intrusive bodies are I-type granites but it is still unclear whether there are contemporary A-type granites. Here, we report the first unambiguous discovery of A-type granite from Baiyashan in the North Dabie tectonic belt. The crystallization age of the body has been fixed as 120.4 ± 1.2 Ma using U–Pb analysis of zircons by LA-ICPMS. The Baiyashan granite is enriched in Si, K, Na, Rb and REE, has elevated FeOtot/(FeOtot + MgO) and Ga/Al ratios, and is depleted in Mg, Ca, Mn, Ba, Sr, P and Ti. The REE composition shows highly fractionated patterns with (La/Yb)N = 6.95–16.68 and Eu*/Eu = 0.33–0.59. Its crystallization age, field relationships, petrographic and geochemical data show beyond doubt that the Baiyashan granite is an Early Cretaceous A-type granite. Sr–Nd isotope systematics are characterized by a high ISr of 0.708–0.714 and a low ɛNd of −7.5 to −19.4, with TDM2 = 1.5–2.5 Ga, and these data indicate that the magmas were dominantly sourced from partial melting of middle to lower crustal intermediate-felsic igneous rocks and mingling with mafic to intermediate magmas, during rift-related magmatism associated with subduction of the Palaeo-Pacific Plate beneath Eastern China in Early Cretaceous times.

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