丹凤超高压地体英云闪长岩脉成因及其对北秦岭早古生代高压-超高压岩石折返过程的制约

宫相宽; 陈丹玲; 木热地力·买合苏提; 谭俊; 李阔; 任云飞; 罗芬红

doi:10.13568/j.cnki.651094.651316.2021.04.05.0002

您当前的位置：

首页 >

文章列表页 >

丹凤超高压地体英云闪长岩脉成因及其对北秦岭早古生代高压-超高压岩石折返过程的制约

生态·资源·环境 | 更新时间：2026-01-21

- 丹凤超高压地体英云闪长岩脉成因及其对北秦岭早古生代高压-超高压岩石折返过程的制约
- 丹凤超高压地体英云闪长岩脉成因及其对北秦岭早古生代高压-超高压岩石折返过程的制约
- 新疆大学学报（自然科学版中英文） 2022年39卷第3期页码：350-362
- 作者机构：
  
  1. 新疆中亚造山带大陆动力学与成矿预测自治区重点实验室新疆大学地质与矿业工程学院
  2. 大陆动力学国家重点实验室西北大学地质学系
- 作者简介：
- 基金信息：
  
  新疆维吾尔自治区自然科学基金（2019D01C030）;新疆维吾尔自治区高校科研计划（XJEDU2021Y012）
- DOI：10.13568/j.cnki.651094.651316.2021.04.05.0002
  中图分类号： P588.122;P534.4;P597.3
- 纸质出版：2022
- 稿件说明：
移动端阅览
[1]宫相宽,陈丹玲,木热地力·买合苏提,等.丹凤超高压地体英云闪长岩脉成因及其对北秦岭早古生代高压-超高压岩石折返过程的制约[J].新疆大学学报(自然科学版)(中英文),2022,39(03):350-362+368.
[1]宫相宽,陈丹玲,木热地力·买合苏提,等.丹凤超高压地体英云闪长岩脉成因及其对北秦岭早古生代高压-超高压岩石折返过程的制约[J].新疆大学学报(自然科学版)(中英文),2022,39(03):350-362+368. DOI： 10.13568/j.cnki.651094.651316.2021.04.05.0002.

DOI：10.13568/j.cnki.651094.651316.2021.04.05.0002.

摘要

在详细野外地质调查的基础上，对秦岭岩群东段陕西丹凤大寺沟超高压变质地体中混合岩化英云闪长岩脉体开展了详细的LA-ICP-MS锆石U-Pb定年和岩石地球化学研究．结果表明：(1)英云闪长岩脉的结晶年龄为417±4Ma，内含1 832～980 Ma、506～490 Ma以及462～443 Ma等多组继承/捕获锆石年龄，其中：第一组年龄与秦岭岩群长英质片麻岩的碎屑锆石年龄一致，后两组年龄对应锆石微区Th/U比值<0.2，且分别显示了榴辉岩相和麻粒岩相变质锆石的稀土元素配分曲线特征；(2)脉体的SiO2含量变化于64.94%～67.89%，显示富Al_2O3(18.24%～20.33%)、高碱(Na＿2O+K＿2O=6.67%～7.54%)特征，Na＿2O/K＿2O>2

A/CNK>1.1，属过铝质中钾钙碱性系列，与I型花岗岩特征相似；微量元素方面富集Rb、Ba、K和轻稀土元素，具有明显Eu正异常，同时具有高Sr(815×10-6～941×10-6)，低Y(2.66×10-6～6.90×10-6)和Yb(0.26×10-6～0.68×10-6)的特征，具有埃达克质岩石属性．综合脉体的岩石地球化学特征、脉体形成年龄(～420 Ma)明显晚于北秦岭超高压变质作用峰期变质时代(～500 Ma)而与区域第二期退变质作用时代(～420 Ma)相当的事实，尤其是脉体锆石中部分榴辉岩相和麻粒岩相继承锆石的存在，无疑表明大寺沟英云闪长岩脉是经历超高压变质的秦岭岩群变质岩石折返过程中部分熔融的产物，而且以榴辉岩的部分熔融为主，伸展背景下幔源岩浆上涌可能为本次部分熔融提供了部分热源．

Abstract

Detailed LA-ICP-MS zircon U-Pb dating and geochemical analysis results of a tonalitic dike from the Dasigou ultrahigh-pressure metamorphic terrain in the eastern Qinling Group were carried out in this paper.The results show that the tonalitic dike was formed at 417±4 Ma. Three groups of inherited/captured zircon ages of 1 832～980 Ma

506～490 Ma and 462～443 Ma are all from the cores of zircons. Among them

the first group of ages(1 832～980 Ma) being consistent with the detrital zircon ages of the gneisses from the Qinling Group. The Th/U ratios of the latter two groups of zircons are less than 0.2

and show the characteristics of REE distribution patterns of eclogite-and granulite-facies metamorphic zircons

respectively. The SiO_2content of the dike varies from 64.94% to 67.89%

showing the characteristics of high Al_2O3(18.24%～20.33%) and alkalinity contents(Na_2O+K_2O=6.67%～7.54%)

Na_2O/K_2O>2

A/CNK>1.1

belonging to the peraluminous mediumpotassium calc-alkaline series

which are similar to I-type granites. The high Sr(815×10-6～941×10-6)

low Y(2.66×10-6～6.90×10-6) and Yb(0.26×10-6～0.68×10-6) contents are similar to adakitic rocks. The rock is rich in Rb

Pb and LREE

with strong Eu positive anomaly in the chondrite-normalized REE pattern. Taken the formation age(～420 Ma) of the tonalitic dike is corresponds to the age of the second phase of retrograde metamorphism(～420 Ma) and obviously later than the peak metamorphic age(～500 Ma) of the UHP metamorphism in the North Qinling

especially due to the existence of zircons inherited from eclogite-and granulite-facies metamorphicrocks in the zircons from the tonalitic dike into condsideration

we believe that the Dasigou tonalitic dike is the product of partial melting during the exhumation of the Qinling Group

which experienced ultrahigh pressure metamorphism

and that the partial melting of eclogites is the main one

possibly accompanied by the upwelling of mantle-derived magma in the extensional setting.

关键词

Keywords

references

钟增球,张宏飞,索书田,等.大别超高压变质岩折返过程中的部分熔融作用[J].地球科学,1999,24(4):393-399.

SONG S G,WANG M J,WANG C,et al.Magmatism during continental collision,subduction,exhumation and mountain collapse in collisional orogenic belts and continental net growth:aperspective[J].Science China(Earth Sciences),2015,58(8):1284-1304.

张国伟,张本仁,袁学诚,等.秦岭造山带与大陆动力学[M].北京:科学出版社,2001.

LIU L,LIAO X Y,WANG Y W,et al.Early Paleozoic tectonic evolution of the North Qinling orogenic belt in central China:insights on continental deep subduction and multiphase exhumation[J].Earth-Science Reviews,2016,159:58-81.

DONG Y P,SANTOSH M.Tectonic architecture and multiple orogeny of the Qinling orogenic belt,central China[J].Gondwana Research,2016,29(1):1-10.

杨经绥,许志琴,裴先治,等.秦岭发现金刚石:横贯中国中部巨型超高压变质带新证据及古生代和中生代两期深俯冲作用的识别[J].地质学报,2002,7(4):484-495.

LIU L,CHEN D L,SUN Y,et al.Discovery of relic majoritic garnet in felsic metamorphic rocks of Qinling omplex,North Qinling orogenic belt,China[C].Selje:The Alice Wain Memorial Western Norway Eclogite Field Symposium,2003,82.

WANG H,WU Y B,GAO S,et al.Deep subduction of continental crust in accretionary orogen:evidence from U-Pb dating on diamond-bearing zircons from the Qinling orogen,central China[J].Lithos,2014,190/191:420-429.

宫相宽,陈丹玲,任云飞,等.北秦岭含柯石英斜长角闪岩的发现及其地质意义[J].科学通报,2016,61(12):1365-1378.

陈丹玲,刘良.北秦岭榴辉岩及相关岩石年代学的进一步确定及其对板片俯冲属性的约束[J].地学前缘,2011,18(2):158-168.

张建新,于胜尧,孟繁聪.北秦岭构造带的早古生代多期变质作用[J].岩石学报,2011,27(4):1179-1190.

CHENG H,ZHANG C,VERVOORT J D,et al.Geochronology of the transition of eclogite to amphibolite facies metamorphism in the North Qinling orogen of central China[J].Lithos,2011,125(3/4):969-983.

刘良,廖小莹,张成立,等.北秦岭高压-超高压岩石的多期变质时代及其地质意义[J].岩石学报,2013,29(5):1634-1656.

LIAO X Y,LIU L,WANG Y W,et al.Multi-stage metamorphic evolution of retrograde eclogite with a granulite-facies overprint in the Zhaigen area of the North Qinling belt,China[J].Gondwana Research,2016,30:79-96.

陈丹玲,刘良,廖小莹,等.北秦岭高压-超高压岩石的时空分布,P-T-t演化及其形成机制[J].地球科学,2019,44(12):4017-4027.

王亚伟,刘良,廖小莹,等.秦岭杂岩清油河斜长角闪岩多期变质的证据:来自锆石微量元素和包裹体的启示[J].岩石学报,2016,32(5):221-246.

张成立,刘良,王涛,等.北秦岭早古生代大陆碰撞过程中的花岗岩浆作用[J].科学通报,2013,58(23):2323-2329.

向华,钟增球,李晔,等.北秦岭造山带早古生代多期变质与深熔作用:锆石U-Pb年代学证据[J].岩石学报,2014,30(8):2421-2434.

罗芬红,陈丹玲,宫相宽,等.北秦岭超高压地体折返过程中的多期次部分熔融[J].岩石学报,2018,34(12):3671-3689.

廖小莹.北秦岭陆壳深俯冲-折返作用及对早古生代构造演化过程的限定[D].西安:西北大学,2018.

LIU Q,WU Y B,WANG H,et al.Zircon U-Pb ages and Hf isotope compositions of migmatites from the North Qinling terrane and their geological implications[J].Journal of Metamorphic Geology,2014,32(2):177-193.

宫相宽.丹凤地区秦岭岩群物质组成、形成时代及变质作用研究[D].西安:西北大学,2017.

第五春荣,孙勇,刘良,等.北秦岭宽坪岩群的解体及新元古代N-MORB[J].岩石学报,2010,26(7):2025-2038.

DONG Y P,ZHANG G W,HAUZENBERGER C,et al.Palaeozoic tectonics and evolutionary history of the Qinling orogen:evidence from geochemistry and geochronology of ophiolite and related volcanic rocks[J].Lithos,2011,122(1/2):39-56.

陆松年,于海峰,李怀坤,等.中央造山带(中-西部)前寒武纪地质[M].北京:地质出版社,2009.

ZHU X Y,CHEN F K,LI S Q,et al.Crustal evolution of the North Qinling terrain of the Qinling orogen,China:evidence from detrital zircon U-Pb ages and Hf isotopic composition[J].Gondwana Research,2011,20(1):194-204.

高胜,陈丹玲,宫相宽,等.天水东岔地区宽坪岩群碎屑岩及其中花岗岩的锆石U-Pb定年及其地质意义[J].地学前缘,2015,22(4):255-264.

孙勇,卢欣祥,韩松,等.北秦岭早古生代二郎坪蛇绿岩片的组成和地球化学[J].中国科学D辑(地球科学),1996,26(S):49-55.

陆松年,李怀坤,陈志宏,等.秦岭中-新元古代地质演化及对Rodinia超级大陆事件的响应[M].北京:地质出版社,2003.

赵姣,陈丹玲,谭清海,等.北秦岭东段二郎坪群火山岩锆石的LA-ICP-MS U-Pb定年及其地质意义[J].地学前缘,2012,19(4):118-125.

杨士杰,陈丹玲,宫相宽,等.北秦岭东段二郎坪群基性火山岩中浅色岩体的地球化学、年代学及其地质意义[J].岩石学报,2015,31(7):2009-2022.

杨敏,刘良,王亚伟,等.北秦岭二郎坪杂岩变沉积岩碎屑锆石年代学及其构造地质意义[J].岩石学报,2016,32(5):1452-1466.

胡能高,赵东林,徐柏青,等.北秦岭含柯石英榴辉岩的发现及其意义[J].科学通报,1994,39(21):2013.

DIWU C R,SUN Y,ZHAO Y,et al.Geochronological,geochemical,and Nd-Hf isotopic studies of the Qinling complex,central China:implications for the evolutionary history of the North Qinling orogenic belt[J].Geoscience Frontiers,2014,5(4):499-513.

陈丹玲,任云飞,宫相宽,等.北秦岭松树沟榴辉岩的确定及其地质意义[J].岩石学报,2015,31(7):1841-1854.

LIU L,CHEN D L,ZHANG J F,et al.The minimum stable pressure and geological significants of supersilic garnet in continental felsic rocks:constraints from HT-HP experiments[J].Acta Geologica Sinica,2020,94(S1):32-33.

DONG Y P,ZHANG G W,NEUBAUER F,et al.Tectonic evolution of the Qinling orogen,China:review and synthesis[J].Journal of Asian Earth Science,2011,41(3):213-237.

LI Y,YANG J S,DILEK Y,et al.Crustal architecture of the Shangdan suture zone in the Early Paleozoic Qinling orogenic belt,China:record of subduction initiation and backarc basin development[J].Gondwana Research,2015,27(2):733-744.

李王晔,李曙光,裴先治,等.西秦岭关子镇蛇绿混杂岩的地球化学和锆石SHRIMP U-Pb年龄[J].岩石学报,2007,23(11):2836-2844.

裴先治,李佐臣,丁仨平,等.西秦岭天水地区岛弧型基性岩浆杂岩的地球化学特征及形成时代[J].中国地质,2005,32(4):529-540.

WANG H,WU Y B,GAO S,et al.Eclogite origin and timings in the North Qinling terrane,and their bearing on the amalgamation of the South and North China Blocks[J].Journal of Metamorphic Geology,2011,29:1019-1031.

秦切,郭瑞清,张晓帆,等.新疆库鲁克塔格兴地Ⅳ号辉长-闪长岩体U-Pb锆石定年及地质意义[J].新疆大学学报(自然科学版),2012,29(2):240-248.

李平,刘伟,朱志新,等.新疆博格达西段石英二长岩锆石SHRIMP U-Pb测年及地质意义[J].新疆大学学报(自然科学版),2013,30(4):476-481.

MANIAR P D,PICCOLI P M.Tectonic discrimination of granitoids[J].Geological Society of America Bulletin,1989,101:635-643.

ROLLINSON H R.Using geochemical data:evaluation,presentation,interpretation[M].London:Longman Scientific&Technical,1993.

WHALEN J B,CURRIE K L,CHAPPELL B W.A-type granites:geochemical characteristics,discrimination and petrogenesis[J].Contributions to Mineralogy and Petrology,1987,95(4):407-419.

COLLINS W J,BEAMS S D,WHITE A J R,et al.Nature and origin of A-type granites with particular reference to southeastern Australia[J].Contributions to Mineralogy&Petrology,1982,80(2):189-200.

时毓,于津海,徐夕生,等.秦岭造山带东段秦岭岩群的年代学和地球化学研究[J].岩石学报,2009,25(10):2651-2670.

杨力,陈福坤,杨一增,等.丹凤地区秦岭岩群片麻岩锆石U-Pb年龄:北秦岭地体中-新元古代岩浆作用和早古生代变质作用的记录[J].岩石学报,2010,26(5):1589-1603.

CHEN D L,LIU L,SUN Y,et al.Felsic veins within UHP eclogite at Xitieshan in North Qaidam,NW China:partial melting during exhumation[J].Lithos,2012,136/137/138/139:187-200.

SUN S S,MCDONOUGH W F.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[J].Geological Society London Special Publications,1989,42(1):313-345.

MCDONOUGH W F,SUNS S.The composition of the earth[J].Chemical Geology,1995,120(3/4):223-253.

DEFANT M J,DRUMMOND M S.Derivation of some modern arc magmas by melting of young subducted lithosphere[J].Nature,1990,347(6294):662-665.

MARTIN H.Adakitic magmas:modern analogues of Archaean granitoids[J].Lithos,1999,46(3):411-429.

陆松年,陈志宏,相振群,等.秦岭岩群副变质岩碎屑锆石年龄谱及其地质意义探讨[J].地学前缘,2006,13(6):303-310.

万渝生,刘敦一,董春艳,等.西峡北部秦岭岩群变质沉积岩锆石SHRIMP定年:物源区复杂演化历史和沉积、变质时代确定[J].岩石学报,2011,27(4):1172-1178.

SKJERLIE K P,DOUCE A E P.The fuid-absent partial melting of a zoisite-bearing quartz eclogite from 1.0 to 3.2 GPa:implications for melting in thickened continental crust and for subduction-zone processes[J].Journal of Petrology,2002,43(2):291-314.

SCHMIDT M W,POLI S.Generation of mobile components during subduction of oceanic crust[J].Treatise on Geochemistry,2003,3:567-591.

BATCHELOR R A,BOWDEN P.Petrogenetic interpretation of granitoid rock series using multicationic parameters[J].Chemical Geology,1985,48(1/2/3/4):43-55.

WATSON E B,HARRISON T.Zircon saturation revisited:temperature and composition effects in a variety of crustal magma types[J].Earth and Planetary Science Letters,1983,64(2):295-304.

邱检生,肖娥,胡建,等.福建北东沿海高分异I型花岗岩的成因:锆石U-Pb年代学,地球化学和Nd-Hf同位素制约[J].岩石学报,2008,24(11):2468-2484.

朱弟成,莫宣学,王立全,等.西藏冈底斯东部察隅高分异I型花岗岩的成因:锆石U-Pb年代学,地球化学和Sr-Nd-Hf同位素约束[J].中国科学(地球科学),2009,39(7):833-848.

刘军锋,孙勇,孙卫东.秦岭拉鸡庙镁铁质岩体锆石LA-ICP-MS年代学研究[J].岩石学报,2009,25(2):320-330.

浏览量

180

下载量

CSCD

文章被引用时，请邮件提醒。

提交

工具集

关联资源

暂无数据