Sm-Nd isotopic age and genesis of gabbro xenoliths in Daoxian County, Hunan Province

Guo, Feng; Wu, Fan; Ge, Lin; Ye, Lin

doi:10.1007/bf02882650

Cited by 32 publications

(16 citation statements)

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“…(1) The early collision between the South China Block (SCB) and the Indo-China Block caused the compressional deformation in the SCB interior and the products of syn-collisional peraluminous granitoids (Carter et al, 2001;Guo et al, 1997;Wang et al, 2007a,b). (2) Following lithospheric extension, magmatism in the SCB interior was characterized by a suite of oceanic island basalt (OIB)-type basalts and alkaline rock associations related to continental rifting Wang et al, 2003).…”

Section: Geological Background and Sample Descriptionmentioning

confidence: 99%

Multi-stage crust–mantle interaction in SE China: Temporal, thermal and compositional constraints from the Mesozoic felsic volcanic rocks in eastern Guangdong–Fujian provinces

Guo

et al. 2012

Lithos

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Section: Geological Background and Sample Descriptionmentioning

confidence: 99%

Multi-stage crust–mantle interaction in SE China: Temporal, thermal and compositional constraints from the Mesozoic felsic volcanic rocks in eastern Guangdong–Fujian provinces

Guo

et al. 2012

Lithos

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“…They are isotopically distinct from Indo-Sinian to early Yanshanian granites, metamorphic basement rocks in the SCB and the lower crust in the Yangtze block (Chen and Jahn, 1998;Shen et al, 1998;Guo et al, 1997b;Li, 1990;Gao et al, 1999). Shuikoushan and Baoshan samples have similar (Guo et al, 1997b;Li, 1990); early Mesozoic S-type granites (Chen and Jahn, 1998;Shen et al, 1998); lower crust of the Yangtze block represented by Kongling TTG rocks (Gao et al, 1999); depleted mantle-derived mafic magma in SHB (224-170 Ma) (Guo et al, 1997a;Zhao et al, 1998). Symbols as in Fig.…”

Section: Fig 5 Chondrite-normalized Ree Patterns (A)-(c) and Primitmentioning

confidence: 99%

“…In addition to voluminous Mesozoic granites in this belt (e.g., HBGMR, 1986;Chen and Jahn, 1998) (Fig. 1(a)), some early Mesozoic high-K diorites-granodiorites and mantle xenoliths-bearing mafic volcanics are present in this zone (Guo et al, 1997a;Zhao et al, 1998;Wang et al, 2001) ( Fig. 1(b)).…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry of early Mesozoic potassium-rich diorites-granodiorites in southeastern Hunan Province, South China: Petrogenesis and tectonic implications

Wang

Guo

2003

Geochem. J.

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The diorites-granodiorites emplaced at ca. 175 Ma in southeastern Hunan tectonic-magmatic belt (SHB), South China Block (SCB), are high-K calc-alkaline. They are characterized by LREE-LILE enrichment and HFSE depletion with slight or no Eu anomalies. Age-corrected initial 87 Sr/ 86 Sr ratio spans a narrow range of 0.707962~0.710396 and ε Nd (t) of -6.98~-2.30. These features are significantly different from those of the neighboring other Mesozoic granitic plutons (Eu/Eu* = 0.30-0.70; 87 Sr/ 86 Sr > 0.710; ε Nd = -12 to -16) in South China, which have been interpreted as the remelting products of Precambrian basement. The crust anatexis cannot account for the geochemical characteristics of these diorites-granodiorites in the SHB. The partial melting of an enriched lithosphere mantle directly produced mafic-intermediate rather than acid magma, and can also not explain the geochemical and isotopic variations exhibited by these diorites-granodiorites. These diorites-granodiorites likely represent partial melting products of mantle-derived basaltic rocks, which were underplated and hybridized with old crust material at lower/middle crust level. Theoretical modeling further suggests that this hybridized source consisted of 15-30% of the lower/middle crust and 70-85% of depleted mantle-derived basaltic rocks. The occurrence of these dioritegranodiorites in southeastern Hunan province therefore marked a major intra-lithospheric extension episode during early Mesozoic.

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“…These include the collision orogenic model [33][34][35], the intracontinental orogenic subduction model [36], a model involving extension, lithospheric thinning and basic magma underplating [37,38], the model of continental collision and crustal thickening [10,31,[39][40][41][42], and the model of flat-slab subduction [43].…”

Section: Discussionmentioning

confidence: 99%

SHRIMP zircon U-Pb ages and tectonic implications for Indosinian granitoids of southern Zhuguangshan granitic composite, South China

et al. 2012

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The large southern Zhuguangshan granitic batholith composite consists of granites with ages varying from the Caledonian through Indosinian to Yanshanian. Based on K-Ar dating data, the ages of the major parts of this composite were previously regarded as Yanshanian. In this study, the SHRIMP zircon U-Pb dating method has been adopted for six plutons, Ledong, Longhuashan, Dawozi, Zhaidi, Baiyun and Jiangnan, in the southern Zhuguangshan composite, in which the four plutons other than Baiyun and Jiangnan were previously regarded as Yanshanian granites. Magmatic zircons from these six plutons, dated by this study, have yielded ages of 239±5 Ma (MSWD = 2.5), 239±5 Ma (MSWD = 2.5), 239±2 Ma (MSWD = 1.7), 239±4 Ma (MSWD = 3.2), 231±2 Ma (MSWD = 0.81) and 231±3 Ma (MSWD = 1.8), respectively. The results indicate that these plutons were formed by early Indosinian magmatism. Geochemical characteristics suggest that these granites were formed in an extensional tectonic environment. Therefore, the Indosinian period granites in the southern Zhuguangshan composite were formed by partial melting of the Paleo-Mesoproterozoic crustal components during the collapse of thickened lithosphere after the collision between the South China and Indosinian plates. granites, SHRIMP zircon U-Pb dating, early Indosinian period, southern Zhuguangshan Citation:Deng P, Ren J S, Ling H F, et al. SHRIMP zircon U-Pb ages and tectonic implications for Indosinian granitoids of southern

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Sm-Nd isotopic age and genesis of gabbro xenoliths in Daoxian County, Hunan Province

Cited by 32 publications

References 4 publications

Multi-stage crust–mantle interaction in SE China: Temporal, thermal and compositional constraints from the Mesozoic felsic volcanic rocks in eastern Guangdong–Fujian provinces

Multi-stage crust–mantle interaction in SE China: Temporal, thermal and compositional constraints from the Mesozoic felsic volcanic rocks in eastern Guangdong–Fujian provinces

Geochemistry of early Mesozoic potassium-rich diorites-granodiorites in southeastern Hunan Province, South China: Petrogenesis and tectonic implications

SHRIMP zircon U-Pb ages and tectonic implications for Indosinian granitoids of southern Zhuguangshan granitic composite, South China

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