All Title Author
Keywords Abstract

Publish in OALib Journal
ISSN: 2333-9721
APC: Only $99


Relative Articles

Geochemistry and petrogene-sis of Jurassic high Sr/low Y granitoids in eastern China:Constrains on crustal thick-ness

Geochemistry and petrogenesis of Late Mesozoic granitoids in southeastern Hubei Province and constrains on the timing of lithospheric thinning, Middle-Lower Reaches of the Yangtze River, eastern China

Petrogenesis and Geochemical Characterization of the Granitoids of the Magba Shear Zone West Cameroon Central Africa

Timing of Palaeoproterozoic crustal shearing in the central Fennoscandian Shield according to U-Pb data from associated granitoids, Finland

The Pan-African calc-alkaline granitoids and the associated mafic microgranular enclaves (MME) around Wadi Abu Zawal area, North Eastern Desert, Egypt: geology, geochemistry and petrogenesis

Zircon U-Pb age and petrogenesis of ore-bearing granitoid for the Chigou Cu-Mo deposit from the Zhashan basin, Shaanxi Province

Intracratonic Palaeoproterozoic granitoids in northern Finland: prolonged and episodic crustal melting events revealed by Nd isotopes and U-Pb ages on zircon

Geochemistry and zircon U-Pb ages of granulite xenolith from Tuoyun basalts, Xinjiang: Implications for the petrogenesis and the lower crustal nature beneath the southwestern Tianshan

Petrogenesis and Geological Implications of Granitoids from Halasen, East Kunlun

Appraisal of Crustal Contamination in Southern Bastar Mafic Dykes in Chattisgarh, India


Geochemistry and petrogenesis of Jurassic high Sr/low Y granitoids in eastern China: Constrains on crustal thickness

DOI: 10.1360/02tb9216

Keywords: granitoids,adakite,TTG,Jurassic,eastern China

Full-Text   Cite this paper   Add to My Lib


The Jurassic high Sr/low Y granitoids in eastern China are characterized by high Sr/Y (27–166) and La/Yb (14–66) ratios, low abundance in Y (6–21 μg/g) and Yb (0.5-2.0 μg/g), comparable with those of adakites defined by Defant et al. Thus, they were recently considered as adakitic rocks by some researchers. Compared with the typical adakites in circum-Pacific margins, however, these high Sr/low Y granitoids have higher K2O ( 3.5%) but lower Al2O3 ( 16.0%) as well as lower Mg# ( 38) and δSrn ( 1.23) values. Furthermore, they show relatively flat HREE patterns with Y/Yb values of 10 close to the chondritic value. These geochemical characteristics indicate a residue mineral assemblage of hornblende, garnet and plagioclase for these high Sr/low Y granitoids melt. Thus, they were generated by partial melting at 9–13 kbar (30–45 km in depth), similar to the Archaean high-Al TTG rather than the modern adakites. Generation of these high Sr/low Y granitoids cannot be considered as evidence for a thickened crust (>50 km) and/or the presence of the “Eastern China Plateau” in Jurassic.


comments powered by Disqus

Contact Us


微信:OALib Journal