浙江瑶坑碱性花岗岩体的年代学、地球化学及其成因与构造指示意义
Geochronology and geochemistry of the Yaokeng alkaline granitic pluton in Zhejiang province: Petrogenetic and tectonic implications
-
摘要: 瑶坑岩体位于闽浙交界沿海地区,是闽浙沿海晚中生代A型花岗岩带中的一个典型碱性花岗岩体.锆石LA-ICPMS U-Pb同位素定年表明,该岩体的形成年龄为91.3±2.5 Ma（MSWD=3.7,2σ）,属晚白垩世岩浆活动的产物.岩石发育特征的微文象结构和晶洞构造,含有典型的碱性铁镁矿物钠铁闪石.地球化学上,该岩体富硅、碱,贫钙、镁,富K、Rb、Cs、Th、U,贫Sr、Ba、P、Ti、Sc.其Nb、Ta、Zr、Hf和Ga等元素的含量也较高,（Ga/Al）×10^4值变化于3.64～4.41,并具显著的铕负异常（δEu=0.15～0.20）.与闽浙沿海A型花岗岩带中的其它岩体相比,瑶坑岩体具有偏高的εNd（t）值（=-0.7～-1.4）和偏低的二阶段Nd模式年龄（t2DM=0.95Ga～1.01Ga）,指示幔源组分对该岩体的形成具有更重要的贡献.在A型花岗岩亚类的判别上,瑶坑岩体以较低的Y/Nb比值和较高的Nb/Ta比值相似于Eby（1992）区分的A.型花岗岩,而明显有别于岩带主体属A2型的特点.岩石产出构造背景及地球化学特征的综合分析表明,多组深断裂交汇,进而引发多量幔源组分参与成岩过程,是导致瑶坑岩体元素-同位素组成与区内其它同类岩体有较明显差别的主要原因.
-
Key words:
- Alkaline granite /
- Zircon U-Pb age /
- Geochemistry /
- Petrogenesis /
- Tectonic significance /
- Yaokeng
-
-
[1] Andersen T.2002. Correction of common lead in U-Pb analyses that do not report 204Pb.Chem.Geol.,192:59-79
[2] Azer MK.2006. The petrogenesis of Late Precambrian felsic alkaline magmatism in south Sinai,Egypt.Acta Geologiea Polonica,56(4):463-484
[3] Boynton WV.1984. Geochemistry of the rare earth elements:Meteorite studies.In:Henderson P(ed).Rare Earth Element Geochemistry.Amsterdam:Elservier,63-114
[4] Dall\'Agnol R and Oliveira DC.2007. Oxidized,magnetite-series,rapakivi-type granites of Caraj(a)s,Brazil:Implications for classification and petrogenesis of A-type granites.Lithos,93:215-233
[5] Depaolo DJ.1988. Neodymium Isotope Geochemistry.New York:Springer-Verlag Berlin Heidelberg
[6] Eby GN.1992. Chemical subdivision of the A-type granitoids:Petrogenetic and tectonic implications.Geology,20:641-644
[7] Faure G.1986. Principles of Isotope Geology.Jones Willey & Sons.141-249
[8] Gao JF,Lu JJ,Lai MY,Lin YP and Pu W.2003. Analysis of trace elements in rock samples using HR-ICPMS.J.Nanjiag.Uni.(Natural Sciences),39(6):844-850(in Chinese with English abstract)
[9] Hang DW,Guo WQ,Li GJ,Kang W and Xu HM.1987. Petrology of Miarolitic Granite Belt in the Southeast Coast of Fujian Province and Their Generation.Beijing:Beijing Science and Techonology Press,1-128(in Chinese)
[10] Hong DW,Wang SG,Han BF and Jin MY.1995. Tectonic setting classifications and discrimination criteria for alkaline granites.Science in China(Series B),25(4):418-426(in Chinese)
[11] Hang DW,Wang SG,Han BF and Jin MY.1996. Post-orogenic alkaline granites from China and comparisons with anorogenic alkaline granites elsewhere.J.Southeast Asian Earth Sciences,13(1):13-27
[12] Kahoui M and Mahdjoub Y.2004. An Eburnian alkaline peralkaline magmatism in the Reguibat rise:The Djebel Drissa ring complex (Eglab Shield,Algeria).J.African Earth Sciences,39(3-5):115-122
[13] Liu CS,Chen XM,Chen PR,Wang RC and Hu H.2003. Subdivision,discrimination criteria and genesis for A-type rock suites.Geological Journal of China Universities,9(4):573-591(in Chinese with English abstract)
[14] Liu CS,Zhu JC,Shen WZ and Xu SJ.1990. Evolution of continental crust and material source(genesis)of granitoids in south China.Geotectonica et Metallogenia,14(2):125-138(in Chinese with English abstract)
[15] Loiselle MC and Wones DR.1979. Characteristics of anorogenic granite.Geological Society of America,Abstracts with Programs,11:468
[16] Ludwig KR.2001. Isoplot/Ex(rev.)2.49:A Geochronological Toolkit for Microsoft Excel.Berkeley Geochronological Center,Spec.,Public.,No.1:1-58
[17] Martin H,Bonin B,Capdevila R,Jahn BM,Lameyre J and Wang Y.1994. The Kuiqi peralkaline granitic complex(SE China):Petrology and geochemistry.J.Petrol.,35:983-1015
[18] Papanastassiou DA and Wasserburg GJ.1969. Initial strontium isotopic abundances and the resolution of small time difference in the formation of planetary objects.Earth Planet Sci.Lett.,5:361-376
[19] Peng YM and Dong CW.1991. A study on the Qingtian alkaline granite,Zhejiang province.J.Nanjing Uni.(Earth Sciences),3:138-147(in Chinese with English abstract)
[20] Poitrasson F.Duthou JL and Pin C.1995. The relationship between petrology and Nd isotopes as evidence for constrasting anorogenic granite genesis:Example for the Corsican Province(SE France).J.Petrol.,36:1251-1274
[21] Qiu js,Wang DZ,McInnes BIA,Jiang SY,Wang RC and Kanisawa S.2004. Two subgroups of A-type granites in the coastal area of Zhejiang and Fujian Provinces,SE China:age and geochemical constraints on their petrogenesis.Transactions of the Royal Society of Edinburgh:Earth Sciences,95:227-236
[22] Qiu JS.Kanisawa Satoshi and Wang DZ.2000. Geochemical characteristics and genetic type of Yaokeng alkali granites in Cangnan County,Zhejiang Province.Acta Petrologica et Mineralogica,19(2):97-105(in Chinese with English abstract)
[23] Schmitt AK,Emmermann R,Trumbull RB.Buhn B and Henjes-kunst F.2000. Petrogenesis and 40Ar/39Ar geochronology of the Brandberg Complex,Namibia:Evidence for a major mantle contribution in metaluminous and peralkaline granites.J.Pertrol.,41(3):1207-1239
[24] Shen WZ,Zhu JC,Liu CS,Xu SJ and Ling HF.1993. Sm-Nd isotopic study of basement metamorphic rocks in south China and its constraint on material sources of granitoids.Acta Petrologica Sinica,9(2):115-124(in Chinese with English abstract)
[25] Tu GC.Zhang YQ and Zhao ZH.1984. Preliminary studies on two alkalirich intrusive beItsl in South China.In:Xu KQ and Tu GC(eds).Geology of Granites and Their Metallogenetic Relations.Nanjing:Jiangsu Science and Techonology Press,21-37(in Chinese)
[26] Wang DZ and Shen WZ.2003. Genesis of granitoids and crustal evolution in southeast China.Earth Science Frontiers,10(3):209-220(in Chinese with English abstract)
[27] Wang YX,Yang JD,Tao XC and Li HM.1988. A study of the Sm-Nd method for fossil,mineral and rock samples,and its application.J.Nanjing Uni.(Natural Sciences Edition),24(2):297-308(in Chinese with English abstract)
[28] Watson EB and Harrison TM.1983. Zircon saturation revisited:Temperature and composition effects in a variety of crustal magma types.Earth Planet.Sci.Lett.,64:295-304
[29] Whalen JB,Currie KL and Chappell BW.1987. A-type granite:Geochemical characteristics,discrimination and petrogenesis.Contrib.Min.Petrol.,95:407-419
[30] Wood DA,Tarney J and Weaver BL.1981. Irace element variations in Atlantic ocean basalts and Proternzoic dykes from Northwest Scotland:Their bearing upon the nature and geochemical evolution of the upper mantle.Tectonophysics,75:91-112
[31] Wu FY,Sun DY,Li HM,Jahn BM and Wilde S.2002. A-type granites in northeastern China:Age and geochemical constraints on their petrogenesis.Chem.Geol.,187:143-173
[32] 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
[33] Yuan HL,Wu FY,Gao S,Liu XM,Xu P and Sun DY.2003. Determination of U-Ph age and rare earth element concentrations of zircons from Cenozoic intrusions in northeastern China by laser ablation ICI-MS.Chinese Science Bulletin,48(22):2411-2421
[34] 高剑峰,陆建军,赖鸣远,林雨萍,濮巍.2003.岩石样品中微量元素的高分辨率等离子质谱分析.南京大学学报(自然科学),39(6):844-850
[35] 洪大卫,王式洗,韩宝福,靳满元.1995.碱性花岗岩的构造环境分类及其鉴别标志.中国科学(B辑),25(4):418-426
[36] 洪大卫,郭文岐,李戈晶,康炜,徐海明.1987.福建沿海晶洞花岗岩带的岩石学和成因演化.北京:北京科学技术出版社,1-128
[37] 刘昌实,陈小明,陈培荣,王汝成,胡欢.2003. A型岩套的分类、判别标志和成因.高校地质学报,9(4):573-591
[38] 刘昌实,朱金初,沈渭洲,徐士进.1990.华南花岗岩物源成因特征与陆壳演化,大地构造与成矿学,14(2):125-138
[39] 彭亚鸣,董传万.1991.浙江青田碱性花岗岩研究.南京大学学报(地球科学),3(2):138-147
[40] 邱检生,蟹泽·聪史,王德滋.2000.浙江苍南瑶坑碱性花岗岩的地球化学及其成因类型.岩石矿物学杂志,19(2):97-105
[41] 沈渭洲,朱金初,刘昌实,徐士进,凌洪飞.1993.华南基底变质岩的Sm-Nd同位素及其对花岗岩类物质来源的制约.岩石学报,9(2):115-124
[42] 涂光炽,张玉泉,赵振华.1984.华南两个富碱侵入岩带的初步研究.见:徐克勤,涂光炽主编.花岗岩地质和成矿关系.南京:江苏科学技术出版社,21-37
[43] 王德滋,沈渭洲.2003.中国东南部花岗岩成因与地壳演化.地学前缘,10(3):209-220
[44] 王银喜,杨杰东,陶仙聪,李惠民.1988.化石、矿物和岩石样品的Sm-Nd同位素实验方法研究及其应用.南京大学学报(自然科学版),21(2):297-308
-
计量
- 文章访问数: 6895
- PDF下载数: 9166
- 施引文献: 0
下载: