皖南泾县茂林岩体锆石U-Pb年龄和Hf同位素特征
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摘要
安徽茂林岩体为中国东部中生代皖南构造-岩浆带中的一个浅层侵入岩体,是檀树岭钼矿和湛岭钼矿的成矿母岩。该岩体的主要岩性为花岗闪长岩、花岗斑岩、斑状花岗闪长岩、二长花岗岩等。对茂林花岗闪长岩体进行LA-ICP-MS锆石UPb测年,结果显示锆石Th/U值为0.38~0.66,为典型的岩浆成因锆石。花岗闪长岩~(206)Pb/~(238)U年龄加权平均值为140.8±0.8Ma(n=19,MSWD=2.3),结合锆石自形、岩浆环带发育等特点,该年龄为茂林花岗闪长岩的成岩年龄,显示岩体形成于早白垩世。锆石Hf同位素分析结果显示,茂林花岗闪长岩锆石振荡岩浆环带具负εHf(t)值(-9.7~-6.2),揭示花岗闪长岩主要形成于下地壳的熔融。
The Maolin pluton is a superficial intrusive body distributed in Maolin Town of Jingxian County. It is an important part of southern Anhui Mesozoic tectonic-magmatic belt in East China, and the granodiorites are parent rocks of the Tanshulin Mo deposit and Zhanlin Mo deposit in southern Anhui. The main lithologies are granodiorites, granite-porphyry, porphyry granites and monzogranite. The LA-ICP-MS zircon U-Pb data show that these rock bodies were formed at 140.8± 0.8 Ma, the zircon has euhedral and magma ring characteristics, and the dating shows that the diagenetic age of Maolin granodiorite is Early Cretaceous.Zircon Hf isotopic data indicate that the zircon zones in the granodiorite samples are heterogeneous in εHf(t) values(-9.7~-6.2),probably indicating the mixed crust materials during the formation of the magma, with old crustal rocks being the main source.
The Maolin pluton is a superficial intrusive body distributed in Maolin Town of Jingxian County. It is an important part of southern Anhui Mesozoic tectonic-magmatic belt in East China, and the granodiorites are parent rocks of the Tanshulin Mo deposit and Zhanlin Mo deposit in southern Anhui. The main lithologies are granodiorites, granite-porphyry, porphyry granites and monzogranite. The LA-ICP-MS zircon U-Pb data show that these rock bodies were formed at 140.8± 0.8 Ma, the zircon has euhedral and magma ring characteristics, and the dating shows that the diagenetic age of Maolin granodiorite is Early Cretaceous.Zircon Hf isotopic data indicate that the zircon zones in the granodiorite samples are heterogeneous in εHf(t) values(-9.7~-6.2),probably indicating the mixed crust materials during the formation of the magma, with old crustal rocks being the main source.
引文
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[2]王德恩,周翔,余心起,等.皖南祁门地区东源钨钼矿区花岗闪长斑岩SHRIMP锆石U-Pb年龄和Hf同位素特征[J].地质通报,2011, 30(10):1514-1529.
[3]王德恩,张元朔,高冉,等.下扬子天目山盆地火山岩锆石LAICP-MS定年及地质意义[J].资源调查与环境, 2014, 35(3):178-184.
[4]秦燕,王登红,侯可军,等.安徽东源钨矿含矿斑岩中的锆石SHRIMP U-Pb年龄及Hf同位素特征[J].矿床地质, 2010, 29(S1):497-498.
[5]薛怀民,汪应庚,马芳,等.皖南太平-黄山复合岩体的SHRIMP年代学:由钙碱性向碱性转变对扬子克拉通东南部中生代岩石圈减薄时间的约束[J].中国科学(D辑), 2009, 39(7):979-993.
[6]侯明金.江南隆起带(安徽部分)燕山晚期岩浆活动与深部过程[D].合肥工业大学博士学位论文, 2005.
[7]周涛发,袁峰,侯明金,等.江南隆起带东段皖赣相邻区燕山期花岗岩类的成因及形成的地球动力学背景[J].矿物岩石, 2004,(3):65-71.
[8]高东升.皖南泾县茂林地区钼矿成矿地质特征及成因探讨[J].世界有色金属, 2017,(6):184-186.
[9]范羽,周涛发,张达玉,等.皖南地区青阳-九华山复式岩体的成因[J].岩石学报, 2016, 32(2):419-438.
[10]袁峰,周涛发,范裕,等.皖赣相邻区燕山期花岗岩类构造背景及其意义[J].合肥工业大学学报(自然科学版), 2005,(9):1130-1134.
[11]宋彪,张玉海,万渝生,等.锆石SHRIMP样品靶制作、年龄测定及有关现象讨论[J].地质论评, 2002, 48(S1):26-30.
[12]Liu Y S, Hu Z C, Zong K Q, et al. Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS[J]. Chinese Science Bulletin. 2010, 55(15):1535-1546.
[13]Hu Z C, Liu Y S, Chen L, et al. Contrasting matrix induced elemental fractionation in NIST SRM and rock glasses during laser ablation ICP-MS analysis at high spatial resolution[J]. Journal of Analytical Atomic Spectrometry, 2011, 26(2):425-430.
[14]Liu Y S, Gao S, Hu Z C, et al. Continental and oceanic crust recycling-induced melt-peridotite interactions in the TransNorth China Orogen:U-Pb dating, Hf isotopes and trace elements in zircons from mantle xenoliths[J]. Journal of Petrology,2010, 51(1/2):537-571.
[15]康永建.内蒙古八大关斑岩型铜钼矿成矿作用研究[D].中国地质科学院(北京)硕士学位论文, 2015.
[16]Belousova E A, Griffin W L, O'Reilly S Y, et al. Igneous zircon:Trace element composittion as an indicator of source rock type[J].Contributions to Mineralogy and Petrology, 2002, 143:602-622.
[17]吴元保,郑永飞.锆石成因矿物学研究及其对U-Pb年龄解释的制约[J].科学通报, 2004, 49(16):1589-1604.
[18]Hoskin P W O, Schaltegger U. The composition of zircon and igneous and metamorphic petrogenesis[J]. Reviews in Mineralogy and Geochemistry, 2003, 53:27-55.
[19]伍俊杰,陈正乐,陈瑞莉,等.江西新余良山钼矿锆石U-Pb和辉钼矿Re-Os年龄[J].地质通报, 2017, 36(8):1407-1416.
[20]陈志洪,郭坤一,董永观,等.江山-绍兴拼合带平水段可能存在新元古代早期板片窗岩浆活动:来自锆石LA-ICP-MS年代学和地球化学的证据[J].中国科学(D辑), 2009, 39(7):994-1008.
[21]陈志洪,邢光福,郭坤一,等.长江中下游成矿带九瑞矿集区(北部)含矿岩体的锆石U-Pb定年及其地质意义[J].地质学报,2011, 85(7):1146-1158.
[22]侯可军,李延河,邹天人,等. LA-MC-ICP-MS锆石Hf同位素的分析方法及地质应用[J].岩石学报, 2007,(10):2595-2604.
[23]Vervoort J D, Vervoort J D, Patchett P J, et al.. Relationshios betw een Lu-Hf and Sm-Nd isotopic systems in the global sedimen tary system[J]. Earth and Planetary Science Letters, 1999,168(1/2):79-99.
[24]陈思.安徽贵池牯牛降复式岩体成岩作用研究[D].合肥工业大学硕士学位论文, 2014.
[25]Blicher-Tofe J, Chauvel C, Albarede F. Separation of Hf and Lu for high-precision isotope analysis of rock samples by magnrtic sector-multiple collector ICP-MS[J]. Contributions to Mineralogy and Petrology, 1997, 127:248-260.
[26]Griffin W L, Wang X, Jackon S E, et al.. Zircon chemistry and magma genesis, SE China:In-situ analysis of Hf isotopes, Tonglu and Pingtan igneous complexes[J]. Lithos, 2002, 61:237-269.
[27]Soderlund U, Patchett P J, Verrot J D, et al.. The176Lu decay contant determined by Lu-Hf and U-Pb isotope systematics of Precambrian mafic intrusion[J]. Earth and Planetary Scicence Letters, 2004, 219:311-324.
[28]吴福元,李献华,郑永飞,等. Lu-Hf同位素体系及其岩石学应用[J].岩石学报, 2007, 23(2):185-220.
[29]Patchett P J, Kouvo O, Hedge C E, et al. Evolution of continental crust and mantle heterogeneity:evdence from Hf isotopes[J].Contributions to Mineralogy and Petrology, 1981, 78:279-297.
[30]Knudsen T L, Griffin W L, Hartz E H, et al. In-situ hafnium and lead isotope analyses of detrital zircons from the Devonian sedimentary basin of NE Greenland:arecord of repeated crustal reworking[J]. Contributions to Mineralogy and Petrology, 2001,141:83-94.
[31]Kinny P D, Mass R. Lu-Hf and Sm-Nd isotope systems in zircon[C]//Hanchar J M, Hoskin P W. Reviews in Mineralogy and geochemistry, 2003, 53:327-341.
[32]Vervoort J D, Patchett P J, Albarede F, et al. Hf-Nd isotopic evolution of teh lower crust[J]. Earth and Planetary Science Letters,2000, 181:115-129.
[33]Griffin W L, Pearson N J, Belousova E, et al.. The Hf isotope composition of cratonic mantle:LAM-MC-ICP MS analysis of zircon megacrysts in kimberlites[J]. Geochimica et Cosmochimica Acta, 2000, 64(1):133-147.
[34]张兴康,叶会寿,李正远,等.小秦岭华山复式岩基大夫峪岩体锆石U-Pb年龄、Hf同位素和地球化学特征[J].矿床地质, 2015,34(2):235-260.
[35]Wu F Y, Ji W Q, Yang Y H, et al.. Zircon U-Pb geochronolgy and Hf isotopic compositions of the Mesozoic granites in southern Anhui Province, China[J]. Lithos, 2012, 150:6-25.
[36]Yang J H, Wu F Y, Shao J, et al. Constraints on the timing of uplift of the Yanshan fold and Thrust belt, North China[J]. Earth and Planetary Science Letters, 2006, 246:336-352.
[37]邢凤鸣,徐祥,陈江峰,等.江南古陆东南缘晚元古代大陆增生史[J].地质学报, 1992,(1):59-72.
[38]舒良树,孙岩.江南中段花岗岩天然变形与显微构造模拟实验研究[J].中国科学(B辑), 1995,(11):1226-1233.
[39]郭令智,卢华复,施央申,等.江南中、新元古代岛弧的运动学和动力学[J].高校地质学报, 1996, 2(1):1-13
[40]朱光,刘国生.皖南江南陆内造山带的基本特征与中生代造山过程[J].大地构造与成矿学, 2000, 24(2):103-111.
[41]汪洋,邓晋福,姬广义.长江中下游地区早白垩世埃达克质岩的大地构造背景及其成矿意义[J].岩石学报, 2004, 20(2):297-314.
[42]毛景文,谢桂青,李晓峰,等.大陆动力学演化与成矿研究:历史与现状——兼论华南地区在地质历史演化期间大陆增生与成矿作用[J].矿床地质, 2005, 24(3):193-205.
[43]Sun W D, Ding X, Hu Y, et al. The golden transformation of the Cretaceous plate subduction in the west Pacific[J]. Earth and Planetary Science Letters, 2007, 262(3/4):533-542.
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