Zircon U-Pb geochronology,geochemistry and petrogenesis of syenogranite from Angeer Yinwula area in Inner Mongolia
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摘要
The study presents the results of U-Pb dating of zircons and whole-rock geochemical analyses of syenogranite in Angeer Yinwula area, China, with the aim of determining its formation time, petrogenesis and regional setting. Zircon U-Pb data obtained by LA-ICP-MS indicate that the syenogranite formed in the Early Cretaceous(136.1±0.9 Ma). Geochemically, the rock is characterized by high SiO_2(76.63%--77.58%) and Na_2O+K_2O(8.00%--8.32%), low MgO(0.02%--0.04%) and TFe_2O_3(0.51%--0.84%), and is enriched in LREEs and LILEs, depleted in HREEs and HFSEs. It belongs to high-K calc-alkaline, metaluminous-weakly peraluminous, exhibiting an affinity to I-type granite. All these characteristics implied that the syenogranite in this region derived from crust-mantle mixed source. Overall, the regional geology, geochronology and geochemical features suggest that the formation of the syenogranite was related to the subduction of the Paleo-Pacific Ocean.
The study presents the results of U-Pb dating of zircons and whole-rock geochemical analyses of syenogranite in Angeer Yinwula area, China, with the aim of determining its formation time, petrogenesis and regional setting. Zircon U-Pb data obtained by LA-ICP-MS indicate that the syenogranite formed in the Early Cretaceous(136.1±0.9 Ma). Geochemically, the rock is characterized by high SiO_2(76.63%--77.58%) and Na_2O+K_2O(8.00%--8.32%), low MgO(0.02%--0.04%) and TFe_2O_3(0.51%--0.84%), and is enriched in LREEs and LILEs, depleted in HREEs and HFSEs. It belongs to high-K calc-alkaline, metaluminous-weakly peraluminous, exhibiting an affinity to I-type granite. All these characteristics implied that the syenogranite in this region derived from crust-mantle mixed source. Overall, the regional geology, geochronology and geochemical features suggest that the formation of the syenogranite was related to the subduction of the Paleo-Pacific Ocean.
The study presents the results of U-Pb dating of zircons and whole-rock geochemical analyses of syenogranite in Angeer Yinwula area, China, with the aim of determining its formation time, petrogenesis and regional setting. Zircon U-Pb data obtained by LA-ICP-MS indicate that the syenogranite formed in the Early Cretaceous(136.1±0.9 Ma). Geochemically, the rock is characterized by high SiO_2(76.63%--77.58%) and Na_2O+K_2O(8.00%--8.32%), low MgO(0.02%--0.04%) and TFe_2O_3(0.51%--0.84%), and is enriched in LREEs and LILEs, depleted in HREEs and HFSEs. It belongs to high-K calc-alkaline, metaluminous-weakly peraluminous, exhibiting an affinity to I-type granite. All these characteristics implied that the syenogranite in this region derived from crust-mantle mixed source. Overall, the regional geology, geochronology and geochemical features suggest that the formation of the syenogranite was related to the subduction of the Paleo-Pacific Ocean.
引文
Belousova E,Griffin W,O'Reilly S Y,et al.2002.Igneous zircon:trace element composition as an indicator of source rock type.Contributions to Mineralogy and Petrology,143(5):602-622.
Chappell B W.1999.Aluminum saturation in I- and S-type granites and the characterization of fractionated haplogranites.Lithos,46:535-551.
Chappell B W,White A J R.1992.I- and S-type granites in the Lachlan Fold Belt.Transactions of the Royal Society of Edinburgh:Earth Sciences,83(1/2):1-26.
Chen J Y,Yang J H.2015.Petrogenesis of the Fogang highly fractionated I-type granitoids:constraints from Nb,Ta,Zr and Hf.Acta Petrologica Sinica,31(3):846-854.(in Chinese with English abstract)
Connelly J N.2000.Degree of preservation of igneous zonation in zircon as a signpost for concordancy in U/Pb geochronology.Chemical Geology,172(1/2):25-39
Eby G N.1990.The A-type granitoids:a review of their occurrence and chemical characteristics and speculations on their petrogenesis.Lithos,26:115-134.
Eby G N.1992.Chemical subdivision of the A-type granitoids:petrogenetic and tectonic implications.Geology,20(7):641-644.
Fan W M,Guo F,Wang Y J,et al.2003.Late Mesozoic calcal-kaline volcanism of post-orogenic extension in the northern Da Hinggan Mountains,northeastern China.Journal of Volcanology and Geothermal Research,121(1):115-135.
Gill J B.1987.Early geochemical evolution of an oceanic island arc and backarc:Fiji and the south Fiji Basin.Journal of Geology,95(5):589-615.
Hong D W,Huang H Z,Xiao Y J,et al.1994.The Permian alkaline granites in central Inner Mongolia and their geodynamic significance.Acta Geologica Sinica,10(3/4),169-176.(in Chinese with English abstract)
Irvine T N,Baragar W R A.1971.A guide to the chemical classification of the common volcanic rocks.Canadian Journal of Earth Sciences,8:523-548.
Jahn B M,Capdevila R,Liu D,et al.2004.Sources of Phanerozoic granitoids in the transect Bayanhongor-Ulaan Baatar,Mongolia:geochemical and Nd isotopic evidence,and implications for Phanerozoic crustal growth.Journal of Asian Earth Sciences,23:629-653.
Jian P,Cheng Y Q,Liu D Y.2001.Petrographic study on the genesis of metamorphic zircon-the basic basis of the U-Pb age interpretation of high-grade metamorphic rocks.Earth Science Frontiers,(3):183-191.
Ke L L,Zhang H Y,Liu J J,et al.2017.Fluid inclusion,H-O,S,Pb and noble gas isotope studies of the Aerhada Pb-Zn-Ag deposit,Inner Mongolia,NE China.Ore Geology Reviews,88:304-316.
Lehmann J,Schulmann K,Lexa O,et al.2000.Structural constraints on the evolution of the Central Asian Orogenic Belt in SW Mongolia.Life Sciences,310:575-628.
Li J,Cai W Y,Fu L J,et al.2018.Genesis and tectonic setting of the Bulage Pb-Zn deposit,Inner Mongolia,China:evidence from geology,fluid inclusions,EMPA,H-O isotope systematics,zircon U-Pb geochronology,and geochemistry.Geological Journal,DOI:10.1002/gj.3410.
Li J Y.2006.Permian geodynamic setting of Northeast China and adjacent regions:Closure of the Paleo-Asian Ocean and subduction of the Paleo-Pacific Plate.Journal of Asian Earth Sciences,26:207-224.
Li J Y,Gao L M,Sun G H,et al.2007.Shuangjingzi Middle Triassic syn-collisional crust-derived granite in the east Inner Mongolia and its constraint on the timing of collision between Siberian and Sino-Korean paleo-plates.Acta Petrologica Sinica,23(3):565-582.(in Chinese with English abstract)
Liu H L,Chen M,Chen P,et al.2011.Gold and polymetallic metallogenic characteristics and prospecting direction of East Ujimqin Banner in the Great Xing'an.Gold Science and Technology,(2):56-60.
Liu Y S,Gao S,Hu Z C,et al.2010.Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China orogen:U-Pb dating,Hf Isotopes and trace elements in zircons of mantle xenoliths.Journal of Petrology,51:537-571.
Ludwig K R.2003.User's manual for Isoplot 3.0:a geochronological toolkit for Microsoft Excel.Berkeley Geochronology Center,1-70.
Maniar P D,Piccoli P M.1989.Tectonic discrimination of granitoids.Geological Society of American Bulletin,101:635-643.
Maruyama S,Isozaki Y,Kimura G,et al.1997.Paleogeographic maps of the Japanese Islands:plate tectonic synthesis from 750 Ma to the present.Island Arc,6:121-142.
Peccerillo A,Taylor D R.1976.Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area,northern Turkey.Contributions to Mineralogy and Petrology,58:63-81.
Qiu J S,Xiao E,Hu J,et al.2008.Petrogenesis of highly fractionated I-type granites in the coastal area of northeastern Fujian Province:constraints from zircon U-Pb geochronology,geochemistry and Nd-Hf isotopes.Acta Petrologica Sinica,24(11):2468-2484.(in Chinese with English abstract)
Sun S S,McDonough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.Geological Society of Special Publication,42:313-345.
Whalen J B,Currie K L,Chappell B W.1987.A-type granites:geochemical characteristics,discrimination and petrogenesis.Contributions to Mineralogy and Petrology,95:407-419.
Windley B F,Alexeiev D,Xiao W,et al.2007.Tectonic models for accretion of the Central Asian Orogenic Belt.Geological Society,164(12):31-47
Wu F Y,Jahn B M,Wilde S A,et al.2000.Phanerozoic crustal growth:U-Pb and Sr-Nd isotopic evidence from the granites in northeastern China.Tectnophysics,328:89-113.
Wu F Y,Jahn B M,Wilde S A,et al.2003.Highly fractionated I-type granites in NE China (I):geochronology and petrogenesis.Lithos,66:241-273.
Wu F Y,Li X H,Yang J H,et al.2007.Discussions on the petrogenesis of granites.Acta Petrologica Sinica,23(6):1217-1238.(in Chinese with English abstract)
Wu F Y,Sun D Y,Ge W C,et al.2011.Geochronology of the Phanerozoic granitoids in northeastern China.J.Asian Earth Science,41:1-30.
Xiao B,Li Q G,Liu S W,et al.2014.Highly fractionated Late Triassic I-type granites and related molybdenum mineralization in the Qinling orogenic belt:geochemical and U-Pb-Hf and Re-Os isotope constraints.Ore Geology Reviews,56:220-233.
Xiao W J,Shu L S,Gao J,et al.2008.Continental dynamics of the Central Asian Orogenic Belt and its metallogeny.Xinjiang Geology,26:4-8.(in Chinese with English abstract)
Xu W L,Ji W Q,Pei F P,et al.2009.Triassic volcanism in eastern Heilongjiang and Jilin provinces,NE China:chronology,geochemistry,and tectonic implications.Journal of Asian Earth Sciences,34:392-402.
Xu W L,Wang F,Pei F P,et al.2013.Mesozoic tectonic regimes and regional ore-forming background in NE China:Constraints from spatial and temporal variations of Mesozoic volcanic rock associations.Acta Petrologica Sinica,29(2):339-353.(in Chinese with English abstract)
Yang K.2013.Ore-forming characters and prospecting orientation of metal deposit in the Dong Ujimqin,Inner Mongolia:master's degree thesis.Beijing:China University of Geoscience.(in Chinese with English abstract)
Yang Y F,Chen Y J,Pirajno F,et al.2015.Evolution of ore fluids in the Donggou giant porphyry Mo system,East Qinling,China,a new type of porphyry Mo deposit:evidence from fluid inclusion and H-O isotope systematics.Ore Geology Reviews,65:148-164.
Yu X Z,Xue C J,Cong L J,et al.2011.A study of the connection of faults and metallogenic belts between Erenhot region,China and South Gobi,Mongolia.Earth Science Frontiers,18(2):231-241.
Zhang J H,Ge W C,Wu F Y,et al.2008.Large-scale Early Cretaceous volcanic events in the northern Great Xing'an Range,Northeastern China.Lithos,102(1/2):138-157.
Zhang W Y,Nie F J,Liu S W,et al.2015.Characteristics and genesis of mineral deposits in East Ujimqin Banner,western segment of the Great Xing'an Mountains,NE China.Journal of Asian Earth Sciences,97:459-471.
Zhao H L,Deng J F,Chen F J,et al.1998.Petrology of the Mesozoic volcanic rocks and the basin formation in the Northeast China.Geoscience,12(1):56-62.(in Chinese with English abstract)
Chappell B W.1999.Aluminum saturation in I- and S-type granites and the characterization of fractionated haplogranites.Lithos,46:535-551.
Chappell B W,White A J R.1992.I- and S-type granites in the Lachlan Fold Belt.Transactions of the Royal Society of Edinburgh:Earth Sciences,83(1/2):1-26.
Chen J Y,Yang J H.2015.Petrogenesis of the Fogang highly fractionated I-type granitoids:constraints from Nb,Ta,Zr and Hf.Acta Petrologica Sinica,31(3):846-854.(in Chinese with English abstract)
Connelly J N.2000.Degree of preservation of igneous zonation in zircon as a signpost for concordancy in U/Pb geochronology.Chemical Geology,172(1/2):25-39
Eby G N.1990.The A-type granitoids:a review of their occurrence and chemical characteristics and speculations on their petrogenesis.Lithos,26:115-134.
Eby G N.1992.Chemical subdivision of the A-type granitoids:petrogenetic and tectonic implications.Geology,20(7):641-644.
Fan W M,Guo F,Wang Y J,et al.2003.Late Mesozoic calcal-kaline volcanism of post-orogenic extension in the northern Da Hinggan Mountains,northeastern China.Journal of Volcanology and Geothermal Research,121(1):115-135.
Gill J B.1987.Early geochemical evolution of an oceanic island arc and backarc:Fiji and the south Fiji Basin.Journal of Geology,95(5):589-615.
Hong D W,Huang H Z,Xiao Y J,et al.1994.The Permian alkaline granites in central Inner Mongolia and their geodynamic significance.Acta Geologica Sinica,10(3/4),169-176.(in Chinese with English abstract)
Irvine T N,Baragar W R A.1971.A guide to the chemical classification of the common volcanic rocks.Canadian Journal of Earth Sciences,8:523-548.
Jahn B M,Capdevila R,Liu D,et al.2004.Sources of Phanerozoic granitoids in the transect Bayanhongor-Ulaan Baatar,Mongolia:geochemical and Nd isotopic evidence,and implications for Phanerozoic crustal growth.Journal of Asian Earth Sciences,23:629-653.
Jian P,Cheng Y Q,Liu D Y.2001.Petrographic study on the genesis of metamorphic zircon-the basic basis of the U-Pb age interpretation of high-grade metamorphic rocks.Earth Science Frontiers,(3):183-191.
Ke L L,Zhang H Y,Liu J J,et al.2017.Fluid inclusion,H-O,S,Pb and noble gas isotope studies of the Aerhada Pb-Zn-Ag deposit,Inner Mongolia,NE China.Ore Geology Reviews,88:304-316.
Lehmann J,Schulmann K,Lexa O,et al.2000.Structural constraints on the evolution of the Central Asian Orogenic Belt in SW Mongolia.Life Sciences,310:575-628.
Li J,Cai W Y,Fu L J,et al.2018.Genesis and tectonic setting of the Bulage Pb-Zn deposit,Inner Mongolia,China:evidence from geology,fluid inclusions,EMPA,H-O isotope systematics,zircon U-Pb geochronology,and geochemistry.Geological Journal,DOI:10.1002/gj.3410.
Li J Y.2006.Permian geodynamic setting of Northeast China and adjacent regions:Closure of the Paleo-Asian Ocean and subduction of the Paleo-Pacific Plate.Journal of Asian Earth Sciences,26:207-224.
Li J Y,Gao L M,Sun G H,et al.2007.Shuangjingzi Middle Triassic syn-collisional crust-derived granite in the east Inner Mongolia and its constraint on the timing of collision between Siberian and Sino-Korean paleo-plates.Acta Petrologica Sinica,23(3):565-582.(in Chinese with English abstract)
Liu H L,Chen M,Chen P,et al.2011.Gold and polymetallic metallogenic characteristics and prospecting direction of East Ujimqin Banner in the Great Xing'an.Gold Science and Technology,(2):56-60.
Liu Y S,Gao S,Hu Z C,et al.2010.Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China orogen:U-Pb dating,Hf Isotopes and trace elements in zircons of mantle xenoliths.Journal of Petrology,51:537-571.
Ludwig K R.2003.User's manual for Isoplot 3.0:a geochronological toolkit for Microsoft Excel.Berkeley Geochronology Center,1-70.
Maniar P D,Piccoli P M.1989.Tectonic discrimination of granitoids.Geological Society of American Bulletin,101:635-643.
Maruyama S,Isozaki Y,Kimura G,et al.1997.Paleogeographic maps of the Japanese Islands:plate tectonic synthesis from 750 Ma to the present.Island Arc,6:121-142.
Peccerillo A,Taylor D R.1976.Geochemistry of Eocene calc-alkaline volcanic rocks from the Kastamonu area,northern Turkey.Contributions to Mineralogy and Petrology,58:63-81.
Qiu J S,Xiao E,Hu J,et al.2008.Petrogenesis of highly fractionated I-type granites in the coastal area of northeastern Fujian Province:constraints from zircon U-Pb geochronology,geochemistry and Nd-Hf isotopes.Acta Petrologica Sinica,24(11):2468-2484.(in Chinese with English abstract)
Sun S S,McDonough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes.Geological Society of Special Publication,42:313-345.
Whalen J B,Currie K L,Chappell B W.1987.A-type granites:geochemical characteristics,discrimination and petrogenesis.Contributions to Mineralogy and Petrology,95:407-419.
Windley B F,Alexeiev D,Xiao W,et al.2007.Tectonic models for accretion of the Central Asian Orogenic Belt.Geological Society,164(12):31-47
Wu F Y,Jahn B M,Wilde S A,et al.2000.Phanerozoic crustal growth:U-Pb and Sr-Nd isotopic evidence from the granites in northeastern China.Tectnophysics,328:89-113.
Wu F Y,Jahn B M,Wilde S A,et al.2003.Highly fractionated I-type granites in NE China (I):geochronology and petrogenesis.Lithos,66:241-273.
Wu F Y,Li X H,Yang J H,et al.2007.Discussions on the petrogenesis of granites.Acta Petrologica Sinica,23(6):1217-1238.(in Chinese with English abstract)
Wu F Y,Sun D Y,Ge W C,et al.2011.Geochronology of the Phanerozoic granitoids in northeastern China.J.Asian Earth Science,41:1-30.
Xiao B,Li Q G,Liu S W,et al.2014.Highly fractionated Late Triassic I-type granites and related molybdenum mineralization in the Qinling orogenic belt:geochemical and U-Pb-Hf and Re-Os isotope constraints.Ore Geology Reviews,56:220-233.
Xiao W J,Shu L S,Gao J,et al.2008.Continental dynamics of the Central Asian Orogenic Belt and its metallogeny.Xinjiang Geology,26:4-8.(in Chinese with English abstract)
Xu W L,Ji W Q,Pei F P,et al.2009.Triassic volcanism in eastern Heilongjiang and Jilin provinces,NE China:chronology,geochemistry,and tectonic implications.Journal of Asian Earth Sciences,34:392-402.
Xu W L,Wang F,Pei F P,et al.2013.Mesozoic tectonic regimes and regional ore-forming background in NE China:Constraints from spatial and temporal variations of Mesozoic volcanic rock associations.Acta Petrologica Sinica,29(2):339-353.(in Chinese with English abstract)
Yang K.2013.Ore-forming characters and prospecting orientation of metal deposit in the Dong Ujimqin,Inner Mongolia:master's degree thesis.Beijing:China University of Geoscience.(in Chinese with English abstract)
Yang Y F,Chen Y J,Pirajno F,et al.2015.Evolution of ore fluids in the Donggou giant porphyry Mo system,East Qinling,China,a new type of porphyry Mo deposit:evidence from fluid inclusion and H-O isotope systematics.Ore Geology Reviews,65:148-164.
Yu X Z,Xue C J,Cong L J,et al.2011.A study of the connection of faults and metallogenic belts between Erenhot region,China and South Gobi,Mongolia.Earth Science Frontiers,18(2):231-241.
Zhang J H,Ge W C,Wu F Y,et al.2008.Large-scale Early Cretaceous volcanic events in the northern Great Xing'an Range,Northeastern China.Lithos,102(1/2):138-157.
Zhang W Y,Nie F J,Liu S W,et al.2015.Characteristics and genesis of mineral deposits in East Ujimqin Banner,western segment of the Great Xing'an Mountains,NE China.Journal of Asian Earth Sciences,97:459-471.
Zhao H L,Deng J F,Chen F J,et al.1998.Petrology of the Mesozoic volcanic rocks and the basin formation in the Northeast China.Geoscience,12(1):56-62.(in Chinese with English abstract)