Geochronology and Geochemistry of the 890 Ma I-Type Granites in the Southwestern Yangtze Block: Petrogenesis and Crustal Evolution

Abstract

The tectonic evolution of the southwestern Yangtze Block during the Early Neoproterozoic period is still controversial because of the limited quantities of 1 000–860 Ma magmatic rocks. In this study, our new LA-ICP-MS zircon U-Pb dating results demonstrate that the Yanbian granodiorites in the southwest Yangtze Block were emplaced at 894.6±7.4 Ma, representing the product of an 894 Ma magmatism. The Yanbian granodiorites are metaluminous to weak peraluminous with A/CNK values of 0.8–1.1, resembling I-type granitoids. They are characterized by right-inclined REE patterns with moderate to insignificant negative Eu anomalies (δEu=0.6–0.9). Their primitive mantle-normalized trace element patterns are characterized by depletion of Nb, Ta and Ti and weakly enrichment of Th. Considering the positive whole-rock ε _Nd(t) (+5.8 to +6.8), we propose that these granodiorites originated from the partial melting of juvenile mafic lower crust. The Yanbian I-type granitoids have low Y and Nb contents similar to volcanic arc igneous rocks in the Y-Nb plot for tectonic discrimination. In conclusion, Early Neoproterozoic Yanbian granodiorites have generated in a compression setting in an active continental margin. Together with previous studies from the southwestern Yangtze Block, we suggest that the 894 Ma subduction-related Yanbian granodiorites represent the early stage of subduction at the southwestern margin of the Yangtze Block.

Keywords

I-type granites / zircon U-Pb dating / Early Neoproterozoic / subduction / southwestern Yangtze Block

References

[1] Bédard J H. Petrogenesis of Boninites from the Betts Cove Ophiolite, Newfoundland, Canada: Identification of Subducted Source Components. Journal of Petrology, 1999, 40(12): 1853-1889.

[2] Chen W T, Sun W H, Wang W, . “Grenvillian” Intra-Plate Mafic Magmatism in the Southwestern Yangtze Block, SW China. Precambrian Research, 2014, 242: 138-153.

[3] Chen W T, Sun W H, Zhou M F, . Ca. 1 050 Ma Intra-Continental Rift-Related A-Type Felsic Rocks in the Southwestern Yangtze Block, South China. Precambrian Research, 2018, 309: 22-44.

[4] Chen W T, Zhou M F, Zhao X F, . Late Paleoproterozoic Sedimentary and Mafic Rocks in the Hekou Area, SW China: Implication for the Reconstruction of the Yangtze Block in Columbia. Precambrian Research, 2013, 231: 61-77.

[5] Clemens J D, Darbyshire D P F, Flinders J. Sources of Post-Orogenic Calcalkaline Magmas: The Arrochar and Garabal Hill-Glen Fyne Complexes, Scotland. Lithos, 2009, 112(3/4): 524-542.

[6] Clemens J. S-Type Granitic Magmas—Petrogenetic Issues, Models and Evidence. Earth-Science Reviews, 2003, 61(1/2): 1-18.

[7] Cui X Z, Jiang X S, Wang J, . Mid-Neoproterozoic Diabase Dykes from Xide in the Western Yangtze Block, South China: New Evidence for Continental Rifting Related to the Breakup of Rodinia Supercontinent. Precambrian Research, 2015, 268: 339-356.

[8] Deng S X. The Evolution of Metamorphism and Geochemistry for the Cangshan and Julin Groups in Central Yunnan, China: [Dissertation], 2000, Guangzhou: Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 41-49. (in Chinese with English Abstract)

[9] Du L L, Guo J H, Nutman A P, . Implications for Rodinia Reconstructions for the Initiation of Neoproterozoic Subduction at ∼860 Ma on the Western Margin of the Yangtze Block: Evidence from the Guandaoshan Pluton. Lithos, 2014, 196/197: 67-82.

[10] Frost C D, Bell J M, Frost B R, . Crustal Growth by Magmatic Underplating: Isotopic Evidence from the Northern Sherman Batholith. Geology, 2001, 29(6): 515-518.

[11] Geng Y S, Kuang H W, Liu Y Q, . Subdivision and Correlation of the Mesoproterozoic Stratigraphy in the Western and Northern Margins of Yangtze Block. Acta Geologica Sinica, 2017, 91(10): 2151-2174. (in Chinese with English Abstract)

[12] Gibson I L, Kirkpatrick R J, Emmerman R, . The Trace Element Composition of the Lavas and Dikes from a 3-km Vertical Section through the Lava Pile of Eastern Iceland. Journal of Geophysical Research: Solid Earth, 1982, 87(B8): 6532-6546.

[13] Greentree M R, Li Z X. The Oldest Known Rocks in South-western China: SHRIMP U-Pb Magmatic Crystallisation Age and Detrital Provenance Analysis of the Paleoproterozoic Dahongshan Group. Journal of Asian Earth Sciences, 2008, 33(5/6): 289-302.

[14] Greentree M R, Li Z X, Li X H, . Late Mesoproterozoic to Earliest Neoproterozoic Basin Record of the Sibao Orogenesis in Western South China and Relationship to the Assembly of Rodinia. Precambrian Research, 2006, 151(1/2): 79-100.

[15] Grimes C B, John B E, Kelemen P B, . Trace Element Chemistry of Zircons from Oceanic Crust: A Method for Distinguishing Detrital Zircon Provenance. Geology, 2007, 35(7): 643-646.

[16] Guan J L, Zheng L L, Lui J H, . Zircons SHRIMP U-Pb Dating of Diabase from Hekou, Sichuan Province, China and Its Geological Significance. Acta Geologica Sinica, 2011, 85(4): 482-490. (in Chinese with English Abstract)

[17] Han Q S, Peng S B, Polat A, . Petrogenesis and Geochronology of Paleoproterozoic Magmatic Rocks in the Kongling Complex: Evidence for a Collisional Orogenic Event in the Yangtze Craton. Lithos, 2019, 342/343: 513-529.

[18] Hu P Y, Zhai Q G, Wang J, . The Shimian Ophiolite in the Western Yangtze Block, SW China: Zircon SHRIMP U-Pb Ages, Geochemical and Hf-O Isotopic Characteristics, and Tectonic Implications. Precambrian Research, 2017, 298: 107-122.

[19] Huang X L, Xu Y G, Lan J B, . Neoproterozoic Adakitic Rocks from Mopanshan in the Western Yangtze Craton: Partial Melts of a Thickened Lower Crust. Lithos, 2009, 112(3/4): 367-381.

[20] Huang X L, Xu Y G, Li X H, . Petrogenesis and Tectonic Implications of Neoproterozoic, Highly Fractionated A-Type Granites from Mianning, South China. Precambrian Research, 2008, 165(3/4): 190-204.

[21] Hui B, Dong Y P, Cheng C, . Zircon U-Pb Chronology, Hf Isotope Analysis and Whole-Rock Geochemistry for the Neoarchean-Paleoproterozoic Yudongzi Complex, Northwestern Margin of the Yangtze Craton, China. Precambrian Research, 2017, 301: 65-85.

[22] Kemp A I S, Hawkesworth C J, Foster G L, . Magmatic and Crustal Differentiation History of Granitic Rocks from Hf-O Isotopes in Zircon. Science, 2007, 315(5814): 980-983.

[23] Lai S C, Qin J F, Zhu R Z, . Neoproterozoic Quartz Monzodiorite-Granodiorite Association from the Luding-Kangding Area: Implications for the Interpretation of an Active Continental Margin along the Yangtze Block (South China Block). Precambrian Research, 2015, 267: 196-208.

[24] Li F H, Tan J M, Shen Y L, . The Pre-Sinian in the Kangdian Area, 1988, Chongqing: Chongqing Publishing House, 396 (in Chinese with English Abstract)

[25] Li Q W, Zhao J H. Nature and Thermal State of the Lithosphere beneath the Western Margin of the Yangtze Block in South China during the Neoproterozoic. The Journal of Geology, 2018, 126(3): 343-360.

[26] Li Q W, Zhao J H. The Neoproterozoic High-Mg Dioritic Dikes in South China Formed by High Pressures Fractional Crystallization of Hydrous Basaltic Melts. Precambrian Research, 2018, 309: 198-211.

[27] Li X H, Li W X, Li Z -X, . 850–790 Ma Bimodal Volcanic and Intrusive Rocks in Northern Zhejiang, South China: A Major Episode of Continental Rift Magmatism during the Breakup of Rodinia. Lithos, 2008, 102(1/2): 341-357.

[28] Li X H, Li Z -X, Zhou H W, . U-Pb Zircon Geochronology, Geochemistry and Nd Isotopic Study of Neoproterozoic Bimodal Volcanic Rocks in the Kangdian Rift of South China: Implications for the Initial Rifting of Rodinia. Precambrian Research, 2002, 113(1/2): 135-154.

[29] Li X H, Li Z X, Ge W C, . Neoproterozoic Granitoids in South China: Crustal Melting above a Mantle Plume at ca. 825 Ma?. Precambrian Research, 2003, 122(1–4): 45-83.

[30] Li Z -X, Li X H, Kinny P D, . The Breakup of Rodinia: Did It Start with a Mantle Plume beneath South China?. Earth and Planetary Science Letters, 1999, 173(3): 171-181.

[31] Li Z -X, Li X H, Zhou H W, . Grenvillian Continental Collision in South China: New SHRIMP U-Pb Zircon Results and Implications for the Configuration of Rodinia. Geology, 2002, 30(2): 163-166.

[32] Li Z -X, Li X H, Kinny P D, . 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, 2003, 122(1/2/3/4): 85-109.

[33] Lu G M, Wang W, Ernst R E, . Petrogenesis of Paleo-Mesoproterozoic Mafic Rocks in the Southwestern Yangtze Block of South China: Implications for Tectonic Evolution and Paleogeographic Reconstruction. Precambrian Research, 2019, 322: 66-84.

[34] Ludwig K R. ISOPLOT 3.00: A Geochronological Toolkit for Microsoft Excel, 2003, California, Berkeley: Berkeley Geochronology Center

[35] Mahoney J J, Saunders A D, Storey M, . Geochemistry of the Volcan de L’Androy Basalt-Rhyolite Complex, Madagascar Cretaceous Igneous Province. Journal of Petrology, 2008, 49(6): 1069-1096.

[36] Meng E, Liu F L, Du L L, . Petrogenesis and Tectonic Significance of the Baoxing Granitic and Mafic Intrusions, Southwestern China: Evidence from Zircon U-Pb Dating and Lu-Hf Isotopes, and Whole-Rock Geochemistry. Gondwana Research, 2015, 28(2): 800-815.

[37] Middlemost E A K. Naming Materials in the Magma/Igneous Rock System. Earth-Science Reviews, 1994, 37(3/4): 215-224.

[38] Pearce J A, Harris N B W, Tindle A G. Trace Element Discrimination Diagrams for the Tectonic Interpretation of Granitic Rocks. Journal of Petrology, 1984, 25(4): 956-983.

[39] Peng M, Wu Y B, Wang J, . Paleoproterozoic Mafic Dyke from Kongling Terrain in the Yangtze Craton and Its Implication. Science Bulletin, 2009, 54(6): 1098-1104.

[40] Polat A, Hofmann A W, Rosing M T. Boninite-Like Volcanic Rocks in the 3.7–3.8 Ga Isua Greenstone Belt, West Greenland: Geochemical Evidence for Intraoceanic Subduction Zone Processes in the Early Earth. Chemical Geology, 2002, 184: 231-254.

[41] Qiu X F, Ling W L, Liu X M, . Recognition of Grenvillian Volcanic Suite in the Shennongjia Region and Its Tectonic Significance for the South China Craton. Precambrian Research, 2011, 191(3/4): 101-119.

[42] Rapp R P, Watson E B. Dehydration Melting of Metabasalt at 8–32 Kbar: Implications for Continental Growth and Crust-Mantle Recycling. Journal of Petrology, 1995, 36(4): 891-931.

[43] Sichuan Bureau of Geology (SBG), 1972. A Report of Regional Geological Survey in Yanbian Area of the People’s Republic of China (Scale of 1: 200 000) (in Chinese)

[44] Smithies R H. The Archaean High-Mg Diorite Suite: Links to Tonalite-Trondhjemite-Granodiorite Magmatism and Implications for Early Archaean Crustal Growth. Journal of Petrology, 2000, 41(12): 1653-1671.

[45] Soesoo A. Fractional Crystallization of Mantle-Derived Melts as a Mechanism for Some I-Type Granite Petrogenesis: An Example from Lachlan Fold Belt, Australia. Journal of the Geological Society, 2000, 157(1): 135-149.

[46] Sun S S, McDonough W F. Chemical and Isotopic Systematics of Oceanic Basalts: Implications for Mantle Composition and Processes. Geological Society, London, Special Publications, 1989, 42(1): 313-345.

[47] Sun W H, Zhou M F. The ∼860 Ma, Cordilleran-Type Guandaoshan Dioritic Pluton in the Yangtze Block, SW China: Implications for the Origin of Neoproterozoic Magmatism. The Journal of Geology, 2008, 116(3): 238-253.

[48] Sun W H, Zhou M F, Zhao J H. Geochemistry and Tectonic Significance of Basaltic Lavas in the Neoproterozoic Yanbian Group, Southern Sichuan Province, Southwest China. International Geology Review, 2007, 49(6): 554-571.

[49] Wang D B, Wang B D, Yin F G, . Petrogenesis and Tectonic Implications of Late Mesoproterozoic A₁- and A₂-Type Felsic Lavas from the Huili Group, Southwestern Yangtze Block. Geological Magazine, 2019, 156(8): 1425-1439.

[50] Wang K, Li Z X, Dong S W, . Early Crustal Evolution of the Yangtze Craton, South China: New Constraints from Zircon U-Pb-Hf Isotopes and Geochemistry of ca. 2.9–2.6 Ga Granitic Rocks in the Zhongxiang Complex. Precambrian Research, 2018, 314: 325-352.

[51] Wang W, Zhou M F, Zhao X F, . Late Paleoproterozoic to Mesoproterozoic Rift Successions in SW China: Implication for the Yangtze Block-North Australia-Northwest Laurentia Connection in the Columbia Supercontinent. Sedimentary Geology, 2014, 309: 33-47.

[52] Wang X C, Li X H, Li W X, . The Bikou Basalts in the Northwestern Yangtze Block, South China: Remnants of 820–810 Ma Continental Flood Basalts?. Geological Society of America Bulletin, 2008, 120(11/12): 1478-1492.

[53] Wang X L, Zhou J C, Griffin W L, . Detrital Zircon Geochronology of Precambrian Basement Sequences in the Jiangnan Orogen: Dating the Assembly of the Yangtze and Cathaysia Blocks. Precambrian Research, 2007, 159(1/2): 117-131.

[54] Whalen J B, Currie K L, Chappell B W. A-Type Granites: Geochemical Characteristics, Discrimination and Petrogenesis. Contributions to Mineralogy and Petrology, 1987, 95(4): 407-419.

[55] Yan D P, Zhou M F, Song H L, . Origin and Tectonic Significance of a Mesozoic Multi-Layer Over-Thrust System within the Yangtze Block (South China). Tectonophysics, 2003, 361(3/4): 239-254.

[56] Yang Y J, Zhu W G, Bai Z J, . Petrogenesis and Tectonic Implications of the Neoproterozoic Datian Mafic-Ultramafic Dykes in the Panzhihua Area, Western Yangtze Block, SW China. International Journal of Earth Sciences, 2016, 106(1): 185-213.

[57] Zhang C H, Gao L Z, Wu Z J, . SHRIMP U-Pb Zircon Age of Tuff from the Kunyang Group in Central Yunnan: Evidence for Grenvillian Orogeny in South China. Chinese Science Bulletin, 2007, 52(11): 1517-1525.

[58] Zhang L J, Ma C Q, Wang L X, . Discovery of Paleoproterozoic Rapakivi Granite on the Northern Margin of the Yangtze Block and Its Geological Significance. Chinese Science Bulletin, 2011, 56(3): 306-318.

[59] Zhang Z Q, Zhang G W, Tang S H, . On the Age of Metamorphic Rocks of the Yudongzi Group and the Archean Crystalline Basement of the Qinling Orogen. Acta Geologica Sinica, 2001, 75: 198-204. (in Chinese with English Abstract)

[60] Zhao G C. Jiangnan Orogen in South China: Developing from Divergent Double Subduction. Gondwana Research, 2015, 27(3): 1173-1180.

[61] Zhao J H, Asimow P D, Zhou M F, . An Andean-Type Arc System in Rodinia Constrained by the Neoproterozoic Shimian Ophiolite in South China. Precambrian Research, 2017, 296: 93-111.

[62] Zhao J H, Li Q W, Liu H, . Neoproterozoic Magmatism in the Western and Northern Margins of the Yangtze Block (South China) Controlled by Slab Subduction and Subduction-Transform-Edge-Propagator. Earth-Science Reviews, 2018, 187: 1-18.

[63] Zhao J H, Zhou M F. Geochemistry of Neoproterozoic Mafic Intrusions in the Panzhihua District (Sichuan Province, SW China): Implications for Subduction-Related Metasomatism in the Upper Mantle. Precambrian Research, 2007, 152(1/2): 27-47.

[64] Zhao J H, Zhou M F. Neoproterozoic Adakitic Plutons and Arc Magmatism along the Western Margin of the Yangtze Block, South China. The Journal of Geology, 2007, 115(6): 675-689.

[65] Zhao J H, Zhou M F. Neoproterozoic Adakitic Plutons in the Northern Margin of the Yangtze Block, China: Partial Melting of a Thickened Lower Crust and Implications for Secular Crustal Evolution. Lithos, 2008, 104(1/2/3/4): 231-248.

[66] Zhao J H, Zhou M F, Wu Y B, . Coupled Evolution of Neoproterozoic Arc Mafic Magmatism and Mantle Wedge in the Western Margin of the South China Craton. Contributions to Mineralogy and Petrology, 2019, 174(4): 36

[67] Zhao J H, Zhou M F, Yan D P, . Zircon Lu-Hf Isotopic Constraints on Neoproterozoic Subduction-Related Crustal Growth along the Western Margin of the Yangtze Block, South China. Precambrian Research, 2008, 163(3/4): 189-209.

[68] Zhao J H, Zhou M F, Yan D P, . Reappraisal of the Ages of Neoproterozoic Strata in South China: No Connection with the Grenvillian Orogeny. Geology, 2011, 39(4): 299-302.

[69] Zhao X F, Zhou M F, Li J W, . Association of Neoproterozoic A- and I-Type Granites in South China: Implications for Generation of A-Type Granites in a Subduction-Related Environment. Chemical Geology, 2008, 257(1/2): 1-15.

[70] Zhao X F, Zhou M F, Li J W, . Late Paleoproterozoic to Early Mesoproterozoic Dongchuan Group in Yunnan, SW China: Implications for Tectonic Evolution of the Yangtze Block. Precambrian Research, 2010, 182(1/2): 57-69.

[71] Zheng Y F, Zhang S B, Zhao Z F, . Contrasting Zircon Hf and O Isotopes in the Two Episodes of Neoproterozoic Granitoids in South China: Implications for Growth and Reworking of Continental Crust. Lithos, 2007, 96(1/2): 127-150.

[72] Zhou B G, Wang S W, Sun X M, . SHRIMP U-Pb Age and Its Significance of Zircons in Welded Tuff of Wangchang Formation in Dongchuan Area, Yunnan Province, SW China. Geological Review, 2012, 58(2): 359-368. (in Chinese with English Abstract)

[73] Zhou G Y, Wu Y B, Wang H, . Petrogenesis of the Huashanguan A-Type Granite Complex and Its Implications for the Early Evolution of the Yangtze Block. Precambrian Research, 2017, 292: 57-74.

[74] Zhou G Y, Wu Y B, Zhang W X, . Circa 900 Ma Low δ¹⁸O A-Type Rhyolite in the Northern Yangtze Block: Genesis and Geological Significance. Precambrian Research, 2019, 324 155-169.

[75] Zhou M F, Kennedy A K, Sun M, . Neoproterozoic Arc-Related Mafic Intrusions along the Northern Margin of South China: Implications for the Accretion of Rodinia. The Journal of Geology, 2002, 110(5): 611-618.

[76] Zhou M F, Yan D P, Kennedy A K, . SHRIMP U-Pb Zircon Geochronological and Geochemical Evidence for Neoproterozoic Arc-Magmatism along the Western Margin of the Yangtze Block, South China. Earth and Planetary Science Letters, 2002, 196(1/2): 51-67.

[77] Zhou M F, Yan D P, Wang C L, . Subduction-Related Origin of the 750 Ma Xuelongbao Adakitic Complex (Sichuan Province, China): Implications for the Tectonic Setting of the Giant Neoproterozoic Magmatic Event in South China. Earth and Planetary Science Letters, 2006, 248(1/2): 286-300.

[78] Zhou M F, Ma Y, Yan D, . The Yanbian Terrane (Southern Sichuan Province, SW China): A Neoproterozoic Arc Assemblage in the Western Margin of the Yangtze Block. Precambrian Research, 2006, 144(1/2): 19-38.

[79] Zhu W G, Zhong H, Li Z X, . SIMS Zircon U-Pb Ages, Geochemistry and Nd-Hf Isotopes of ca. 1.0 Ga Mafic Dykes and Volcanic Rocks in the Huili Area, SW China: Origin and Tectonic Significance. Precambrian Research, 2016, 273: 67-89.

[80] Zhu Y, Lai S C, Qin J F, . Petrogenesis and Geodynamic Implications of Neoproterozoic Gabbro-Diorites, Adakitic Granites, and A-Type Granites in the Southwestern Margin of the Yangtze Block, South China. Journal of Asian Earth Sciences, 2019, 183: 103977

[81] Zhu Y, Lai S C, Qin J F, . Neoproterozoic Peraluminous Granites in the Western Margin of the Yangtze Block, South China: Implications for the Reworking of Mature Continental Crust. Precambrian Research, 2019, 333 105443

[82] Zhu Y, Lai S C, Qin J F, . Geochemistry and Zircon U-Pb-Hf Isotopes of the 780 Ma I-Type Granites in the Western Yangtze Block: Petrogenesis and Crustal Evolution. International Geology Review, 2019, 61(10): 1222-1243.

[83] Zhu Y, Lai S C, Qin J F, . Genesis of ca. 850–835 Ma High-Mg^# Diorites in the Western Yangtze Block, South China: Implications for Mantle Metasomatism under the Subduction Process. Precambrian Research, 2020, 343 105738

[84] Zhu Y, Lai S C, Qin J F, . Petrogenesis and Geochemical Diversity of Late Mesoproterozoic S-Type Granites in the Western Yangtze Block, South China: Co-Entrainment of Peritectic Selective Phases and Accessory Minerals. Lithos, 2020, 352/353 105326

[85] Zong K Q, Klemd R, Yuan Y, . The Assembly of Rodinia: The Correlation of Early Neoproterozoic (ca. 900 Ma) High-Grade Metamorphism and Continental Arc Formation in the Southern Beishan Orogen, Southern Central Asian Orogenic Belt (CAOB). Precambrian Research, 2017, 290 32-48.