Geochemical characteristics of the Yao’an and Machangqing alkaline-rich intrusions in the Ailaoshan-Jinshajiang belt, Western Yunnan, China

Bi, Xian‐Wu; Hu, Ruizhong; Peng, Jiantang; Li, Liu; Kai-xing, WU; Su, Wenchao

doi:10.1016/j.gca.2006.06.1278

Cited by 3 publications

(4 citation statements)

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“…Tapponnier et al, 1990;Hou et al, 1996Hou et al, , 2007Yin and Harrison, 2000). These alkaline igneous rocks vary from basaltic to trachytic and rhyolitic in composition and belong to a group of high-K calc-alkaline and shoshonitic rocks (e.g., Zhang andXie, 1997；Hou et al, 2003;Bi et al, 2005) with ages varying between 43 and 27 Ma (e.g., Liang et al, 2008;Xu et al, 2012;He et al, 2013He et al, , 2016Zhu et al, 2013;He et al, 2015;Deng et al, 2015;Yang et al, 2017).…”

Section: Geological Setting and Samplingmentioning

confidence: 99%

Mixing of Enriched Lithospheric Mantle‐Derived and Crustal Magmas: Evidence from the Habo Cenozoic Porphyry in Western Yunnan

Xia

Yuan

et al. 2018

Acta Geologica Sinica (Eng)

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New zircon U–Pb ages, whole‐rock geochemistry and zircon Hf isotopes from the Habo porphyry Western Yunnan, China, were determined to provide constraints on the timing of uplift of the Eastern Tibetan Plateau. The intrusive rocks consist of shoshonitic porphyry (syenite porphyry and monzonite porphyry). Zircon laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) U–Pb dating indicates coeval emplacement ages of ~35 Ma. The porphyries have alkaline affinities, enrichment in large ion lithophile elements (LILEs) and light rare earth elements (LREEs) (e.g., Rb, Th, U, Pb), with depletion of high field strength elements (HFSEs) (e.g., Nb, Ti, Ta) and weak Eu anomalies. They display uniform Lu–Hf isotopic compositions with negative zircon εHf(t) values ranging from ‐3.9 to ‐0.6. The chemical characteristics of the syenite porphyries indicated that they most likely originated from the lower crust, with mantle‐derived material involved in their generation. Geochemically, the monzonite porphyries are similar to the syenite porphyries; however, the lower MgO contents suggest that they were produced by different degrees of partial melting of the same lower crust source. Combined with the geochemical and isotopic data in this paper, imply that the alkali‐rich porphyries of the Habo polymetallic deposit were derived from the partial melting of lower crust, enriched by mantle magma, formed in a conversion stage from stress extrusion (a strike‐slip shear process) to local stress relaxation (a strike‐slip pull‐apart process) at the Ailaoshao tectonic zone.

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Section: Geological Setting and Samplingmentioning

confidence: 99%

Mixing of Enriched Lithospheric Mantle‐Derived and Crustal Magmas: Evidence from the Habo Cenozoic Porphyry in Western Yunnan

Xia

Yuan

et al. 2018

Acta Geologica Sinica (Eng)

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“…w( 87 Sr)/w( 86 Sr) value within magmatic body nearly keeps a constant and ranges from 0.706 4 to 0.711 624, with an average value of 0.707 75, which is below 0.708. All the features mentioned above show that it is derived from mantle, but it might be derived from crust-mantle [14][15]21], indicating that the crustal contamination is not obvious in the process of magma rising [1,62]. The Sr, Nd, and Pb compositons of alkali-rich rocks fall in between typical depleted mantle and crust [24,50], of which I Sr of Yan'an magmatic body ranges from 0.708 8 to 0.709 3, ε Nd varies from −9.2 to −10.6, I Sr ranges from 0.706 1 to 0.708 2, and ε Nd ranges from −3.1 to −10.2 in Machangqing magmatic body.…”

Section: ) H O Isotopementioning

confidence: 99%

“…These two magmatic bodies have a high I Sr and low ε Nd , which has similar variation tendency with Sr and Nd isotope compositon (I Sr =0.705 4−0.707 2, ε Nd =−1.8−−6.3) within Ailaoshan− Jinshajiang belt measured by other people. And it is close to EMII mantle end member [63−64], which is a kind of metasomatic rich mantle related to recycle between crust and mantle, and I Sr is high and ε Nd is low [1].…”

Section: ) H O Isotopementioning

confidence: 99%

“…However, gold deposites in a certain distance to the magmatic body in the later stage [38]. BI et al [1] proposed that within the AilaoshanJingsha River belt, gold mineralization is intimated related to the volcanic activity, which are the products of relatively high-temperature, low-pressure and high oxygen fugacity fluids, and copper mineralization, however, is associated with the magmatic activity of alkali to sub-alkali rich rocks, which are derived from low-temperature, high-pressure and low oxygen fugacity fluids.…”

Section: Metallogenetic Relation Of Alkali-rich Rocksmentioning

confidence: 99%

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Petrological characteristics, geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province, China

Zhang

Dai

2011

J. Cent. South Univ. Technol.

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The alkali-rich rocks, spreading along the suture zone of Jingsha River, refer to the alkali-rich porphyry rocks, which emplace during the Himalaya epoch in northwest of Yunnan Province, and consist of syenit, syenit porphyry, monzonite porphyry and granite porphyry. Petrological chemical analysis results suggest that silica is poor and aluminum is rich, and high potassium large ion lithophile elements (LILE), light rare earth element (LREE) and Sr are obviously detracted in these rocks. High field strength elements (HFSE) and heavy rare earth element (HREE) are depleted, especially Nb, Ta, P and Ti. δ Eu : 0.09−1.64 shows that plagioclase does not appear fractional crystallization during the formation of alkali-rich rocks. δ 34 S, H and O isotopes and Pb isotopes suggest that ore-forming fluid is derived from the mantle, and Pb is possibly mixed by mantle, wall rock and crust. The age of Pb in alkali-rich rocks is about 250−220 Ma. The age of alkali porphyry rock (dykes) varies from 30 Ma to 50 Ma. Alkali rocks have strong metallogenetic relation. Au mineralization is associated to the alkali magmatic activities with a relatively high temperature, low pressure and high oxygen fugacity. However, copper mineralization is mainly associated with alkali-sub-alkali magmatic activities in a process of relatively low temperature, high pressure and lower oxygen fugacity.

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Petrogenesis of Eocene mineralized porphyry in Bijiashan, eastern margin of Tibet Plateau: Constraints from geochronology, geochemistry and Hf isotopes

Zhou

Wang

et al. 2018

Lithos

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Geochemical characteristics of the Yao’an and Machangqing alkaline-rich intrusions in the Ailaoshan-Jinshajiang belt, Western Yunnan, China

Cited by 3 publications

References 0 publications

Mixing of Enriched Lithospheric Mantle‐Derived and Crustal Magmas: Evidence from the Habo Cenozoic Porphyry in Western Yunnan

Mixing of Enriched Lithospheric Mantle‐Derived and Crustal Magmas: Evidence from the Habo Cenozoic Porphyry in Western Yunnan

Petrological characteristics, geochemical feature and metallogenetic relation of alkaline-rich rocks in northwest of Yunan Province, China

Petrogenesis of Eocene mineralized porphyry in Bijiashan, eastern margin of Tibet Plateau: Constraints from geochronology, geochemistry and Hf isotopes

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