Geochronology, geochemical characteristics and tectonic implications of the amphibolite from Paxialayidang area on the southern margin of Altun terrain
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摘要:
阿尔金造山带南缘帕夏拉依档沟零星发育一些斜长角闪岩,主要呈透镜状或豆荚状产于阿尔金岩群大理岩中。文章对这些斜长角闪岩开展了岩相学、年代学以及地球化学方面的研究,获得斜长角闪岩LA-ICP-MS锆石U-Pb年龄为(857.4±7.1)Ma和(432.5±5)Ma,前者代表其形成年龄,后者代表其变质年龄。地球化学特征显示斜长角闪岩轻稀土微弱富集,轻重稀土分异不显著,并有部分消减带玄武岩地球化学特征,源区为古俯冲带再循环的富集地幔源区,并受到流体或熔体的改造。结合判别图解和区域构造演化,分析得出斜长角闪岩原岩形成于初始裂谷环境,是大陆拉张向裂谷转换机制下形成的过渡岩石类型,较新年龄(432.5±5)Ma为早志留世陆壳伸展和软流圈底辟作用引起的变质年龄。本次研究为新元古代中晚期阿尔金南缘基性岩浆活动提供了新的年代学和地球化学方面的证据,这期基性岩浆活动可能为Rodinia超大陆初始裂解事件在阿尔金南缘的响应。
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关键词:
- 斜长角闪岩 /
- 帕夏拉依档 /
- 初始裂谷 /
- Rodinia超大陆 /
- 阿尔金南缘
Abstract:Amphibolite is distributed sporadically in Paxialayidang area on the southern margin of Altun terrain. The amphibolite is ellipsoidal or lenticular in shape and is wrapped by marble of Altun terrain. In this paper, the authors studied petrology, geochronology and geochemistry of the amphibolites. LA-ICPMS zircon U-Pb dating yielded ages of (432.5±5) Ma and (857.4±7.1) Ma for metamorphic event and protolith respectively, and shows that the protolith was formed during Neoproterozoic Qingbaikou period. Amphibolite is slightly enriched in REE, and shows unnoticeable fractionation between light rare earth elements (LREE) and heavy rare earth elements (LREE) and the signatures of subduction zone basalt. The primary magma originated from an enriched mantle source, which was formed by the recirculation of subducted slab, and was modified by fluid or melt subsequently. Combined with the evolution of regional tectonic, the authors hold that the protolith of amphibolite was formed in an incipient continental rift and was a transitional type formed during the transition from continental extension to continental rift. The younger age of (432.5±5) Ma represents the time of metamorphic event, which was caused by the detachment of continental lower crust during Early Silurian. In this paper, the authors provide new geochronological and geochemical evidence about basic magmatic activity during middle-late stage of Neoproterozoicin on the southern margin of Altun terrain. The basic magmatic activity was the response to the Rodinia supercontinent breakup on the southern margin of Altun terrain.
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1. 研究目的(Objective)
松科二井,获取了从基底—火石岭组—沙河子组—营城组—登娄库组下部连续完整的原位岩心。本文对松科二井沙河子组上部的孢粉化石进行研究,为研究白垩纪地球温室气候和环境变化,建立服务“百年大庆”目标和基础地质研究的“金柱子”提供基础资料。
2. 研究方法(Methods)
孢粉样品采自松科二井3395.46~3901.35 m,岩性为黑色、灰黑色泥岩、粉砂质泥岩,层位为沙河子组上部。孢粉分析鉴定在吉林大学古生物学与地层学研究中心完成,具体过程为:每个样品取过筛的干样50 g,进行盐酸→氢氟酸→氢氧化钾→盐酸→硝酸→氢氧化钾→盐酸等分析处理,用筛选法将样品中的孢粉化石集中在试管中,制2个固定片在生物显微镜下鉴定。
3. 研究结果(Results)
依据松科二井3395.46~3901.35 m井段的孢粉化石演化特征,划分出两个孢粉组合。
(1)Leiotriletes sp.- Cyathidites australis - Chasmatosporites sp.组合(简称LCC组合),分布在3832.94~3901.35m井段。蕨类孢子占绝对优势,裸子类花粉较低,未见被子类花粉。蕨类孢子含量最高的是Cyathidites australis,其次是Leiotriletes sp.和Cyclogranisporites sp.,有时代意义的还有Cicatricosisporites exilis、C. minutaestriatus、C. splendidus、C.australiensis、Klukisporites sp.、Maculatisporites sp.、Triporoletes singularis、Trilobosporites tribotrys、Aequitriradites sp.和Polycingulatisporites reduncus等;裸子类花粉含量最高的是Chasmatosporites sp.,其次是Psophosphaera sp.,有时代意义的类型有Parvisaccites sp.、Erlianpollis minisculus、Paleoconifersp.、Pseudowalchia sp.和Classopollis sp.等。
(2)Klukisporites triangulus- Aequitriradites sp.- Pristinuspollenites sp.组合(简称KAP组合),分布在3395.46~3613.62 m井段。裸子类花粉百分含量(53.03%~72.13%)较高,其次为蕨类孢子(27.87% ~46.97%),未见到被子类花粉。裸子类花粉中含量最高的是Alisporites parvus,其次是Piceaepollenites sp.,含量较高的类型还有Chasmatosporites sp.、Pinuspollenites divulgatus和P. sp.等,有时代意义的还有Parvisaccites otagoensis、Erlianpollis minisculus、E. mediocris、Jiaohepollis sp.和Classopollis classoides等。蕨类孢子含量最高的是Klukisporites sp.,其次是Leiotriletes sp.和Cyathidites australis,含量较高的类型还有Cyclogranisporites sp.等,有时代意义的有Cicatricosisporites exilis、C.apiteretus、C. australiensis、Klukisporites triangulus、K.variegatus、Pilosisporites scitulus、Impardecispora sp.、Levisporites wulinensis、Triporoletes singularis、Trilobosporites humilis、Aequitriradites sp.和Schizaeoisporites sp.等。
含有早白垩世特有或在早白垩世繁盛的分子:Cicatricosisporites、Klukisporites、Pilosisporites、Maculatisporites、Impardecispora、Levisporites、Triporoletes、Trilobosporites、Aequitriradites、Schizaeoisporites、Polycingulatisporites、Parvisaccites、Paleoconiferus、Erlianpollis、Foveotriletes.和Classopollis等(图 1)。
图 1 松科二井沙河子组部分孢粉化石(1-Cicatricosisporites exilis,样品号:SK2-375;2. -Cicatricosisporites minutaestriatus,标品号:SK2-385;3-Cicatricosisporites splendidus,标品号:SK2-385;4-Cicatricosisporites australiensis,样品号(sample number):SK2-375;5-Levisporites wulinensis,样品号(sample number):SK2-205;6. Aequitriradites sp.,样品号(sample number):SK2-389; 7-Trilobosporites tribotrys,样品号(sample number):SK2-389;8- Classopollis classoides,标品号:SK2-97;9-Erlianpollis minisculus,样品号(number):SK2-395; 10. Parvisaccites sp.,样品号:SK2-395;11. Pilosisporites scitulus,标品号:SK2-201;12-Triporoletes asper,标品号(specimen number):SK2-219;13. Foveotriletes subtriangulularis,样品号:SK2-219;14-Klukisporites triangulus,样品号(sample number):SK2-205;15-Impardecispora sp.,样品号:SK2-201; 16-Schizaeoisporites polaris,样品号:SK2-173;17-Polycingulatisporites reduncus,标品号:SK2-395;18-Maculatisporites sp.,样品号:SK2-391。19-Chasmatosporites sp.,样品号:SK2-389; 20-Paleoconiferae sp.,样品号(sample number):SK2-391;线段比例尺为10 μm, the scale of the line segment is 10 μm)Figure 1. Spores and pollen from the Lower Cretaceous Shahezi Formation in Well SK2上述2个孢粉组合分布在,属沙河子组上部,LCC组合蕨类孢子百分含量占绝对优势,裸子类花粉较少,从组合特点来看,可以与高瑞琪等人建立的沙河子组上部Granulatisporites-Lophotriletes-Cicatricosisporites组合大致对比,但上部的KAP组合层位显然高于高瑞琪等人建立的孢粉组合。与高瑞琪等人建立的孢粉组合相比,当前孢粉组合出现的有时代意义的孢粉类型更多且时代更新。
4. 结论(Conclusions)
两个孢粉组合海金砂科孢子繁盛,类型多样化,没有发现早期被子植物花粉;虽在蕨类孢子与裸子类花粉的百分含量及属种构成上明显不同,但出现的有时代意义的化石类型基本相同,其时代均为早白垩世早期。
5. 致谢(Acknowledgement)
本文为国家自然科学基金项目(41790451)和中国地质调查局项目(DD20190097)共同资助。孢粉化石由张淑琴研究员鉴定。
致谢: 本稿在成文过程中,匿名评审专家和编辑部的老师给出了建设性的审稿意见,中国地质大学(武汉)续海金老师、吴元保老师和西安地调中心的专家也提出了指导性建议,笔者在此一并表示衷心的感谢。 -
图 1 研究区地质简图及采样位置
TRB—塔里木盆地; QL—祁连山; QDB—柴达木盆地; WKL—西昆仑; EKL—东昆仑; TIBET—西藏; HMLY—喜马拉雅山; INP—印度板块; Ⅰ—阿北变质地块; Ⅱ—红柳沟-拉配泉混杂岩带; Ⅲ—米兰河-金雁山地块; Ⅳ—阿尔金南缘俯冲碰撞杂岩带; 1—第四系; 2—新近系油砂山组; 3—侏罗系大煤沟组;4—奥陶纪茫崖蛇绿混杂岩; 5—青白口系索尔库里群; 6—古元古代阿尔金岩群; 7—玉苏普阿勒塔格岩体;8—帕夏拉依档岩体;9—亚干布阳片麻岩;10—盖里克片麻岩;11—超基性岩块体; 12—玄武岩块体; 13—辉长岩脉;14—斜长角闪岩;15—区域大断裂;16—韧性剪切带;17—断层;18—不整合界限; 19—采样位置
Figure 1. Simplified geological map of the study area and sampling sites
TRB-Tarim basin; QL-Qilian Mountains; QDB-Qaidam basin; WKL-West Kunlun; EKL-East Kunlun; TIBET-Tibet; INP-Indian plate; HMLY-The Himalayas; INP-Indian plate; Ⅰ-Metamorphism plot of northern Altyn; Ⅱ-Hongliugou-Lapeiquan melange; Ⅲ-Milanhe-Jinyanshan plot; Ⅳ-Subduction collision complex zone of southern Altyn; 1-Quaternary; 2-Youshashan Formation; 3-Dameigou Group; 4-Mangya ophiolite melange; 5-Suoerkuliqun Group; 6-Aerjin Group; 7-Yusupualetage rock body; 8-Paxialayidang rock body; 9-Yaganbuyang gneiss; 10-Gailike gneiss; 11-Ultrabasic block; 12-Basalt block; 13-Gabbro dyke; 14-Amphibolite; 15-Regional fault; 16-Ductile shear zone; 17-Fault; 18-Unconformity; 19-Sampling location
图 2 斜长角闪岩野外及镜下特征
a、b—样品呈透镜状或豆荚状产出;c—单偏镜下斜长角闪岩;d—正交镜下斜长角闪岩Q—石英;Am—角闪石;Ep—绿帘石;Ch—绿泥石;Bi—黑云母
Figure 2. Photos of the outcrops and microscopic identification
a, b-Amphibolite in lenticular or podiform form in the open pit; c-Amphibolite (plainlight); d-Amphibolite (crossed nicols) Q-Quartz; Am-Amphibole; Ep-Epidote; Ch-Chlorite; Bi-Biotite
图 4 斜长角闪岩的TAS图解(a, 据文献[21])和Nb/Y-Zr/TiO2图解(b, 据文献[22])
Ir—Irvine分界线,上方为碱性,下方为亚碱性;1—橄榄辉长岩;2a—碱性辉长岩;2b—亚碱性辉长岩;3—辉长闪长岩;4—闪长岩;5—花岗闪长岩;6—花岗岩;7—硅英岩;8—二长辉长岩;9—二长闪长岩;10—二长岩;11—石英二长岩;12—正长岩;13—副长石辉长岩;14—副长石二长闪长岩;15—副长石二长正长岩;16—副长正长岩;17—副长深成岩;18—霓方钠岩/磷霞岩/粗白榴岩
Figure 4. TAS diagram (a) and Nb/Y versus Zr/TiO2 diagram of the Plagioclase amphibolites (b)
Ir-Irvine dividing line, The upper part is alkaline and the lower is sub-alkaline; 1-Olivine gabbro; 2a-Alkaline gabbro; 2b-Sub-alkaline gabbro; 3-Gabbro-diorite; 4-Diorite; 5-Granodiorite; 6-Granite; 7-Quartzolite; 8-Monzogabbro; 9-Monzodiorite; 10-Monzonite; 11-Adamellite; 12-Syenite; 13-Foid-gabbro; 14-Foid-monzodioritee; 15-Foid-monzosyenite; 16-Foid-syenite; 17-Foid-plutonite; 18-Beloeilite/urtite/italite
图 6 斜长角闪岩不活动元素构造环境判别图解
a—玄武岩的Cr-Y判别图解据文献[37];VAB—火山弧玄武岩,WPB—板内玄武岩,MORB—大洋中脊玄武岩;b—玄武岩Zr-Zr/Y判别图解据文献[37],IAB—岛弧玄武岩; MORB—大洋中脊玄武岩; WPB—板内玄武岩;c—玄武岩Nb/Zr-Th/Zr判别图解据文献[38],A—大洋板块发散边缘N-MORB区; B1—大洋岛弧玄武岩区; B2—陆缘岛弧及陆缘火山弧玄武岩区; C—大洋板内区; D1—陆内裂谷及陆缘裂谷拉斑玄武岩区; D2—大陆拉张带(或初始裂谷)玄武岩区; D3—陆-陆碰撞带玄武岩; E—地慢热柱玄武岩区
Figure 6. Immobile trace element tectonic discrimination diagrams of plagioclase amphibolite
a-Cr-Y tectonic discrimination diagrams for the basalt; VAB-Volcanic arc basalts; WPB-Intraplate basalt; MORB-Mid ocean ridge basalt; b-Zr-Zr/Y, IAB=Island arc basalts; WPB-Intraplate basalt; MORB-Mid ocean ridge basalt; c-Nb/Zr-Th/Zr. A-Margin of divergent ocean; B1-Island arc of continental margin; B2-Volcanic arc of continental margin; C-Oceanic intraplate; D1-Continental rift; D2-Tentional zone; D3-Collision zone of two continental plates; E-Mantle plume
表 1 帕夏拉依档斜长角闪岩锆石LA-ICP-MS U-Pb测年分析结果
Table 1 LA-ICP-MS U-Pb analytical results of zircon from amphibolite of the Paxialayidang area
表 2 帕夏拉依档斜长角闪岩主量元素(%)、微量元素(10-6)地球化学测试结果
Table 2 Major (%) and trace elements (10-6) concentrations of the amphibolite in Paxialayidang area
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