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Geochronology, mineralogy and geochemistry of alkali-feldspar granite and albite granite association from the Changyi area of Jiao-Liao-Ji Belt: Implications for Paleoproterozoic rifting of eastern No
Ting-Guang Lan;  Hong-Rui Fan;  Kui-Feng Yang;  Ya-Chun Cai;  Bo-Jie Wen;  Wen Zhang
2016
Source PublicationPrecambrian Research
Volume266Pages:86-107
Abstract

Paleoproterozoic granites, divided into alkali-feldspar granite and albite granite, were newly discovered in the Changyi area of the Jiao-Liao-Ji Belt from the Eastern Block of the North China Craton. LA-ICP-MS zircon U-Pb dating shows that the alkali-feldspar granite was emplaced at 2193 Ma, whereas the albite granite intruded at 2171 Ma. These granites have high SiO2, Na2O + K2O, Zr, Nb, Ga, Y and HREE contents and show remarkably low CaO, Eu, Ba and Sr concentrations, strongly suggesting their A-type affinities. Zircon saturation thermometry and Al-T-in-biotite geobarometer indicate that the alkali-feldspar granite crystallized at temperatures of 823-856 degrees C (averaging at 839 degrees C) and pressures of 1.54-2.73 kbar (averaging at 2.05 kbar) while the albite granite was cooled at the temperatures of 851-853 degrees C and the pressures of 2.34-2.64 kbar (averaging at 2.45 kbar). Combined with such high temperatures and low pressures, the crustal-like Nd-Hf isotopic compositions (epsilon(Nd)(t)= -5.3 to -4.4, epsilon(Hf)(t) = -7.0 to -3.8.) support their derivation from the shallow melting of Archean crustal rocks under high heat flow. However, the contrasted K2O and Na2O compositions between the alkali-feldspar granite (K2O = 4.76-5.14 wt%, Na2O = 4.76-5.14 wt.%) and the albite granite (K2O = 0.29-0.44 wt.%, Na2O = 6.15-6.56 wt.%) imply that they may have been derived from distinct source rocks or have undergone different magmatic processes. Genetic modeling suggests that the alkali-feldspar granite was originated from melting of granodioritic rocks. The albite granite, however, was most likely derived from the reworking of plagioclase-rich layers after the extraction of A-type melts. Coupled with other studies on sedimentary and volcanic successions in the Jiao-Liao-Ji Belt, the unusual association of the A-type alkali-feldspar granite and albite granite indicates that the southern segment of the Jiao-Liao-Ji Belt experienced continental rifting during 2.1-2.2 Ga.

KeywordA-type Granite Albite Granite Paleoproterozoic Continental Rift Jiao-liao-ji Belt North China Craton
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8206
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
3.Tianjin North China Geological Exploration General Institute, Tianjin 300170, China
Recommended Citation
GB/T 7714
Ting-Guang Lan;Hong-Rui Fan;Kui-Feng Yang;Ya-Chun Cai;Bo-Jie Wen;Wen Zhang. Geochronology, mineralogy and geochemistry of alkali-feldspar granite and albite granite association from the Changyi area of Jiao-Liao-Ji Belt: Implications for Paleoproterozoic rifting of eastern No[J]. Precambrian Research,2016,266:86-107.
APA Ting-Guang Lan;Hong-Rui Fan;Kui-Feng Yang;Ya-Chun Cai;Bo-Jie Wen;Wen Zhang.(2016).Geochronology, mineralogy and geochemistry of alkali-feldspar granite and albite granite association from the Changyi area of Jiao-Liao-Ji Belt: Implications for Paleoproterozoic rifting of eastern No.Precambrian Research,266,86-107.
MLA Ting-Guang Lan;Hong-Rui Fan;Kui-Feng Yang;Ya-Chun Cai;Bo-Jie Wen;Wen Zhang."Geochronology, mineralogy and geochemistry of alkali-feldspar granite and albite granite association from the Changyi area of Jiao-Liao-Ji Belt: Implications for Paleoproterozoic rifting of eastern No".Precambrian Research 266(2016):86-107.
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