LA-ICPMS zircon U-Pb ages and geochemistry of Neoproterozoic low-grade metavolcanic rocks in Wuyuan-Dexing area of northeastern Jianxi Province
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摘要:
赣东北婺源-德兴地区新元古代地层中浅变质火山岩主要由变质玄武岩、英安岩和流纹岩组成。全岩地球化学分析表明浅变质玄武岩具有拉斑玄武岩的地球化学特征，起源于尖晶石辉橄岩低度部分熔融，英安岩岩浆起源于壳源杂砂岩部分熔融，流纹岩可能为英安质岩浆结晶分异的产物。LA-ICP-MS锆石U-Pb同位素定年揭示婺源浅变质英安岩形成于861±8Ma，德兴张村西浅变质流纹岩形成于860±3Ma，铜厂铜矿矿区凝灰质板岩形成于860±6Ma，均为早新元古代Tonian期。同时这些定年样品中保存了2.8~2.5Ga、2.0~1.7Ga和~1.0Ga的继承或捕获锆石记录。结合浅变质玄武岩和英安质火山岩的地球化学特征和成因，这套岩石最有可能形成于新元古代早期安第斯型活动大陆边缘弧后盆地构造背景。
Abstract:Low-grade metamorphosed volcanic rocks consist mainly of metamorphic basalt, dacite and rhyolite in the Wuyuan to Dexing region of the northeastern Jiangxi Province. Whole-rock geochemical analyses reveal that the metabasalt has chemical features of the tholeiite, and the basaltic magma originated from low-degreed partial melting of a spinel lhezolite in disturbed deleted mantle. However, the dacitic magma was derived from a partial melting of a meta-greywacke, and the rhyolite was produced by the fractionation of the dacitic magma. LA-ICP-MS zircon U-Pb isotope dating indicates low-grade meta-dacite from the Wuyuan area was formed at 861±8Ma, and meta-rhyolite and tuffaceous slate from the Dexing area at 860±3Ma and 860±6Ma, respectively, which indicate that these metamorphic volcanic rocks erupted at Neoproterozoic Tonian era. Meanwhile, these samples also preserved some signatures of Neoarchean (2.8~2.5Ga), Middle-Late Paleoproterozoic (2.0~1.7Ga) and Mesoproterozoic (~1.0 Ga) inherited and/or captured zircon ages. Integrated the whole-rock geochemistry, petrogenesis and zircon ages, we suggest that these metamorphic volcanic rocks formed under an Early Neoproterozoic tectonic background of back-arc basin in Andes-type actively continental margin.
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图 1
赣东北地区新元古代构造分区图(据邓国辉等，2005; 高林志等，2008修改)
Figure 1.
A Neoproterozoic tectonic classification diagram of northeastern Jiangxi Province (revised after Deng et al., 2005; Gao et al., 2008)
图 2
浅变质火山岩化学成分分类(a, 据Le Maitre, 2002; b, 据Rollinson, 1993)
Figure 2.
Chemical classifications of the low-grade metamorphic volcanic rocks (a, after Le Maitre, 2002; b, after Rollinson, 1993)
图 3
球粒陨石标准化稀土图谱(a)和原始地幔标准化蛛网图(b)(球粒陨石和原始地幔值据Sun and McDonough, 1989)
Figure 3.
Chondrite-normalized REE patterns (a) and primitive-normalized spidergrams (b) (the values of the chondrite and primitive mantle are after Sun and McDonough, 1989)
图 4
珍珠山群浅变质英安岩锆石U-Pb谐和线图(a、b)和万年群浅变质流纹岩锆石U-Pb谐和线图(c、d)
Figure 4.
Zircon U-Pb isotope concordia diagrams for a low-grade metamorphic dacite from Zhenzhushan Group (a, b) and a rhyolite from Wannian Goup (c, d)
图 5
凝灰质板岩的锆石U-Pb年龄图
Figure 5.
Zircon U-Pb isotope dating diagrams of a tufaceous slate from Wannian Group
图 6
岩石成因鉴别图(a, 底图引自Sylvester, 1998)
Figure 6.
Discrimination diagrams for petrogenesis (a, after Sylvester, 1998)
图 7
浅变质英安岩和流纹岩构造环境鉴别图(据Pearce et al., 1984)
Figure 7.
Tectonic discrimination diagrams (after Pearce et al., 1984)
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Andersen T. 2002. Correction of common lead in U-Pb analyses that do not report 204Pb. Chemical Geology, 192(1-2): 59-79
Charvet J, Shu LS, Shi YS, Guo LZ and Faure M. 1996. The building of South China: Collision of Yangtze and Cathaysia blocks, problems and tentative answers. Journal of Southeast Asian Earth Sciences, 13(3-5): 223-235
Deng GH, Lou FS and Huang CG. 2003. Establishment of the Zhenzhushan Group in northeast Jiangxi and its significance. Geological Bulletin of China, 22(1): 32-42 (in Chinese with English abstract)
Deng GH, Liu CG and Feng Y. 2005. Tectonic features and evolution of the Proterozoic orogenic belt between northeastern Jiangxi and southern Anhui. Acta Geoscientica Sinica, 26(1): 9-16 (in Chinese with English abstract)
Dong SW, Xue HM, Xiang XK and Ma LC. 2010. The discovery of Neoproterozoic pillow lava in spilite-ceratophyre of Lushan area, northern Jiangxi Province, and its geological significance. Geology in China, 37(4): 1021-1033 (in Chinese with English abstract)
Gao LZ, Yang MG, Ding XZ, Liu YX, Liu X, Ling LX and Zhang CH. 2008. SHRIMP U-Pb zircon dating of tuff in the Shuangqiaoshan and Heshangzhen groups in South China-constraints on the evolution of the Jiangnan Neoproterozoic orogenic belt. Geological Bulletin of China, 27(10): 1744-1751 (in Chinese with English abstract)
Gao LZ, Dai CG, Liu YX, Wang M, Wang XH, Chen JS, Ding XZ, Zhang CH, Cao Q and Liu JH. 2010. Zircon SHRIMP U-Pb dating of tuff bed of the Sibao Group in southeastern Guizhou-northern Guangxi area, China and its stratigraphic implication. Geological Bulletin of China, 29(9): 1259-1267 (in Chinese with English abstract)
Gao LZ, Liu YX, Ding XZ, Zhang CH, Wang ZQ, Chen J and Liu YR. 2012. SHRIMP dating of Cangshuipu Group in the middle part of the Jiangnan Orogen and its implications for tectonic evolutions. Geology in China, 39(1): 12-20 (in Chinese with English abstract)
Greentree MR, Li ZX, Li XH and Wu HC. 2006. Late Mesoproterozoic to earliest Neoproterozoic basin record of the Sibao orogenesis in western South China and relationship to the assembly of Rodinia. Precambrian Research, 151(1-2): 79-100
Guo LZ, Shi YS and Ma RS. 1980. The geotectonic framework and crustal evolution of South China. In: Scientific Paper on Geology for International Exchange. Beijing: Geological Publishing House, 109-116 (in Chinese)
Hoskin PWO and Schaltegger U. 2003. The composition of zircon and igneous and metamorphic petrogenesis. In: Hanchar JM and Hoskin PWO (eds.). Zircon. Reviews in Mineralogy & Geochemistry, Mineralogical Society of America, Washington DC, 53(1): 27-62
Le Maitre RW. 2002. Igneous Rocks: A Classification and Glossary of Terms. 2nd Edition. Cambridge: Cambridge University Press, 1-236
Li XH, Zhou GG, Zhao JX, Fanning CM and Compston W. 1994. SHRIMP ion microprobe zircon U-Pb age of the NE Jiangxi ophiolite and its tectonic implications. Geochimica, 23(2): 125-131 (in Chinese with English abstract)
Li XH. 1999. U-Pb zircon ages of granites from the southern margin of the Yangtze Block: Timing of Neoproterozoic Jinning: Orogeny in SE China and implications for Rodinia assembly. Precambrian Research, 97(1-2): 43-57
Li XH, Li ZX, Ge WC, Zhou HW, Li WX, Liu Y and Wingate MTD. 2003a. Neoproterozoic granitoids in South China: Crustal melting above a mantle plume at ca. 825Ma? Precambrian Research, 122(1-4): 45-83
Li XH, Li WX and He B. 2012. Building of the south China block and its relevance to assembly and breakup of Rodinia supercontinent. Bulletin of Mineralogy, Petrology and Geochemistry, 31(6): 543-559 (in Chinese with English abstract)
Li ZX, Li XH, Kinny PD, Wang J, Zhang S and Zhou H. 2003b. Geochronology of Neoproterozoic syn-rift magmatism in the Yangtze Craton, South China and correlations with other continents: Evidence for a mantle superplume that broke up Rodinia. Precambrian Research, 122(1-4): 85-109
Li ZX, Li XH, Wartho JA, Clark C, Li WX, Zhang CL and Bao C. 2010. Magmatic and metamorphic events during the Early Paleozoic Wuyi-Yunkai orogeny, southeastern South China: New age constraints and pressure-temperature conditions. Geological Society of America Bulletin, 122(5-6): 772-793
Liu SW, Pan YM, Li JH, Li QG and Zhang J. 2002. Geological and isotopic geochemical constraints on the evolution of the Fuping Complex, North China Craton. Precambrian Research, 117(1-2): 41-56
Liu SW, Pan YM, Xie QL, Zhang J and Li QG. 2004. Archean geodynamics in the Central Zone, North China Craton: Constraints from geochemistry of two contrasting series of granitoids in the Fuping and Wutai complexes. Precambrian Research, 130(1-4): 229-249
Liu SW, Pan YM, Xie QL, Zhang J, Li QG and Yang B. 2005. Geochemistry of the Paleoproterozonic Nanying granitic gneisses in the Fuping complex: Implications for the tectonic evolution of the Central zone, North China Craton. Journal of Asian Earth Sciences, 24(5): 643-658
Liu SW, Li QG, Tian W, Wang ZQ, Yang PT, Wang W, Bai X and Guo RR. 2011a. Petrogenesis of Indosinian granitoids in middle-segment of South Qinling tectonic belt: Constraints from Sr-Nd isotopic systematics. Acta Geologica Sinica, 85(3): 610-628
Liu SW, Santosh M, Wang W, Bai X and Yang PT. 2011b. Zircon U-Pb chronology of the Jianping Complex: Implications for the Precambrian crustal evolution history of the northern margin of North China Craton. Gondwana Research, 20(1): 48-63
Liu SW, Zhang J, Li QG, Zhang LF, Wang W and Yang PT. 2012. Geochemistry and U-Pb zircon ages of metamorphic volcanic rocks of the Paleoproterozoic Lüliang Complex and constraints on the evolution of the Trans-North China Orogen, North China Craton. Precambrian Research, 222-223: 173-190
Ludwig KR. 2003. Isoplot 3.0: A geochronological toolkit for Microsoft Excel. Berkeley Geochronology Center, Special Publication, (4): 1-70
Pearce JA, Harris NBW and Tindle AG. 1984. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks. Journal of Petrology, 25(4): 956-983
Rollinson HR. 1993. Using Geochemical Data, Evolution, Presentation, Interpretation. London: Longman Scientific & Technical, 1-284
Sun SS and McDonough WF. 1989. Chemical and isotopic systematics of oceanic basalts: Implications for mantle compositions and processes. In: Saunders AD and Norry MJ (eds.). Magmatism in the Ocean Basins. Geological Society, London, Special Publications, 42(1): 313-345
Sylvester PJ. 1998. Post-collisional strongly peraluminous granites. Lithos, 45(1-4): 29-44
van Achterbergh E, Ryan C, Jackson S and Griffin W. 2001. Appendix 3 Data reduction software for LA-ICP-MS in "Laser-Ablation-ICPMS in the Earth Sciences". In: Sylvester P (ed.). Mineralogical Association of Canada Short Course, 29: 239-243
Wang J. 2000. Neoproterozoic Rifting History of South China: Significance Rodinia Breakup. Beijing: Geological Publication House, 108-119 (in Chinese)
Wang W, Liu SW, Bai X, Yang PT, Li QG and Zhang LF. 2011. Geochemistry and zircon U-Pb-Hf isotopic systematics of the Neoarchean Yixian-Fuxin greenstone belt, northern margin of the North China Craton: Implications for petrogenesis and tectonic setting. Gondwana Research, 20(1): 64-81
Wang W, Liu SW, Wilde SA, Li QG, Zhang J, Bai X, Yang PT and Guo RR. 2012a. Petrogenesis and geochronology of Precambrian granitoid gneisses in western Liaoning Province: Constraints on Neoarchean to Early Paleoproterozoic crustal evolution of the North China Craton. Precambrian Research, 222-223: 290-311
Wang W, Liu SW, Feng YG, Li QG, Wu FH, Wang ZQ, Wang RT and Yang PT. 2012b. Chronology, petrogenesis and tectonic setting of the Neoproterozoic Tongchang dioritic pluton at the northwestern margin of the Yangtze Block: Constraints from geochemistry and zircon U-Pb-Hf isotopic systematics. Gondwana Research, 22(2): 699-716
Wang W, Liu SW, Santosh M, Bai X, Li QG, Yang PT and Guo RR. 2013. Zircon U-Pb-Hf isotopes and whole-rock geochemistry of granitoid gneisses in the Jianping gneissic terrane, western Liaoning Province: Constraints on the Neoarchean crustal evolution of the North China Craton. Precambrian Research, 224: 184-221
Wang XL, Zhou JC, Qiu JS and Gao JF. 2004. Geochemistry of the Meso-to Neoproterozoic basic-acid rocks from Hunan Province, South China: Implications for the evolution of the western Jiangnan orogen. Precambrian Research, 135(1-2): 79-103
Wang XL, Zhou JC, Qiu JS, Zhang WL, Liu XM and Zhang GL. 2006. LA-ICP-MS U-Pb zircon geochronology of the Neoproterozoic igneous rocks from Northern Guangxi, South China: Implications for tectonic evolution. Precambrian Research, 145(1-2): 111-130
Wang XL, Zhou JC, Griffin WL, Wang RC, Qiu JS, O’ Reilly SY, Xu XS, Liu XM and Zhang GL. 2007. Detrital zircon geochronology of Precambrian basement sequences in the Jiangnan orogen: Dating the assembly of the Yangtze and Cathaysia Blocks. Precambrian Research, 159(1-2): 117-131
Wang XL, Zhao GC, Zhou JC, Liu YS and Hu J. 2008. Geochronology and Hf isotopes of zircon from volcanic rocks of the Shuangqiaoshan Group, South China: Implications for the Neoproterozoic tectonic evolution of the eastern Jiangnan orogen. Gondwana Research, 14(3): 355-367
Wu YB and Zheng YF. 2004. Genesis of zircon and its constraints on interpretation of U-Pb age. Chinese Science Bulletin, 49(15): 1554-1569
Yang PT, Liu SW, Li QG, Wang ZQ, Wang RT and Wang W. 2012. Geochemistry and zircon U-Pb-Hf isotopic systematics of the Ningshan granitoid batholith, middle segment of the south Qinling belt, Central China: Constraints on petrogenesis and geodynamic processes. Journal of Asian Earth Sciences, 61: 166-186
Ye MF, Li XH, Li WX, Liu Y and Li ZX. 2007. SHRIMP zircon U-Pb geochronological and whole-rock geochemical evidence for an early Neoproterozoic Sibaoan magmatic arc along the southeastern margin of the Yangtze Block. Gondwana Research, 12(1-2): 144-156
Zhang F, Liu SW, Li QG, Sun YL, Wang ZQ, Yan QR and Yan Z. 2011. Re-Os and U-Pb geochronology of the erlihe Pb-Zn deposit, Qinling orogenic belt, central China, and constraints on its deposit genesis. Acta Geologica Sinica, 85(3): 673-682
Zhang F, Liu SW, Chen X, Li QG, Dai JZ, Yang K, Wu FH and Chen YZ. 2012. Xiba granitic pluton in the Qinling Orogenic Belt, Central China: Its petrogenesis and tectonic implications. Acta Geologica Sinica, 86(5): 1128-1142
Zhao JX, Li XH, McCulloch MT, Zhou GQ and Xing FM. 1995. Petrogenesis of ophiolites from South Anhui and Northeast Jiangxi, and their tectonic implications: Chemical and Sm-Nd isotopic constraints. Geochimica, 24(4): 311-324 (in Chinese with English abstract)
Zhou XM, Zou HB, Yang JD and Wang YX. 1989. Sm-Nd isochron age and its geological significance for ophiolite from Fuchuan of the She County of Anhui Province. Chinese Science Bulletin, (16): 1243-1245 (in Chinese)
Zhou XM and Zhu YH. 1993. Late Proterozoic collisional orogen and geosuture in southeastern China: Petrological evidence. Chinese Journal of Geochemistry, 12(3): 239-251
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