Petrogenesis of Neoarchean Ananba Quartz Diorite Gneiss in Southeastern Margin of Tarim: Implications for Crustal Evolution
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摘要: 目前塔里木地块东南缘早前寒武纪岩石形成时代和成因机制研究较为薄弱，制约了人们对塔里木大陆地壳形成和早期演化的认识.岩石地球化学及锆石Hf同位素组成表明塔里木地块东南缘安南坝石英闪长片麻岩原岩岩浆为下地壳变玄武岩部分熔融形成，并有少量幔源物质的加入.LA-ICP-MS锆石U-Pb测年结果显示石英闪长片麻岩成岩年龄为2 662±12 Ma、2 676±15 Ma，结合已有资料综合说明塔里木东南缘太古宙岩石形成时代主要集中在2.55~2.70 Ga，变质年龄分别为1 980±30 Ma、1 828±20 Ma~2 087±29 Ma，是古元古代中晚期与造山作用有关的岩浆-变质事件的地质记录.石英闪长片麻岩中锆石两阶段模式年龄TDM2为2 954~3 742 Ma，峰值为~3.24 Ga，据此认为~3.2 Ga是塔里木东南缘大陆地壳生长的主要时期，并于2.55~2.70 Ga发生地壳再造，古老地壳再循环可能是该地区新太古代中晚期大陆地壳演化的重要方式.Abstract: The study on the formation age and petrogenetic mechanism of early Precambrian rocks in the southeast margin of Tarim block is relatively weak, which restricts the understanding of the formation and early evolution of continental crust. These geochemistry and zircon Hf isotope compositions show that primary magma of the quartz diorite gneiss was formed by partial melting of the lower crust meta-basalt with minor addition of mantle-derived materials. LA-ICP-MS zircon U-Pb dating results reveal that the diagenetic ages of the quartz diorite gneiss are 2 662±12 Ma and 2 676±15 Ma, indicating the Archean rock formation ages in the southeastern margin of Tarim were mainly concentrated in 2.55－2.70 Ga; corresponding metamorphic ages are 1 980±30 Ma and 1 828±20 Ma－2 087±29 Ma respectively, representing the geological record of magmatic-matamorphic events related to orogenic processes in the middle and late period of Paleoproterozoic in the southeastern margin of Tarim. Additionally, two-stage model ages(TDM2)of zircon for the quartz diorite gneiss in this study vary from 2 954 to 3 742 Ma, with peak ages clustering at ~3.24 Ga. Thus, combined with the available data, it is suggested that the ~3.2 Ga age represents the main period of continental crustal growth in the southeastern margin of Tarim, and subsequently crustal reconstruction occurred in 2.55－2.70 Ga. It is concluded that ancient crustal material recycling could be an important way of continental crustal evolution in the middle and late period of Neoarchean in this area.
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Key words:
- quartz diorite gneiss /
- petrology /
- geochemistry /
- zircon U-Pb age /
- Hf isotope /
- southeastern margin of Tarim
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图 1 塔里木盆地周缘前寒武纪变质岩分布图（据Lu et al., 2008）及研究区地质图（据辜平阳等，2019a）
Fig. 1. Distributions of Precambrian metamorphic rocks around Tarim basin(after Lu et al., 2008) and the geological map of study area (after Gu et al., 2019a)
图 2 安南坝石英闪长片麻岩露头（a、b）及镜下特征照片（c、d）
Qz.石英；Pl.斜长石；Hbl.角闪石；Aug.辉石；Bit.黑云母；Ser.绢云母
Fig. 2. The outcrops(a, b) and minerals assemblage(c, d)of quartz diorite gneissin Annanba area, southeastern Tarim
图 3 安南坝石英闪长片麻岩中代表性锆石CL图像及锆石U-Pb年龄谐和图
实线圈为U-Pb定年测点位置；虚线圈为Lu-Hf同位素测点位置；标注年龄值为207Pb/206Pb年龄
Fig. 3. Representative zircon CL images and concordia diagrams of the quartz diorite gneissin Annanba area
图 4 安南坝石英闪长片麻岩Na2O-SiO2图解（a）及A/CNK-A/NK图解（b）
Fig. 4. Na2O-SiO2 diagram(a) and A/CNK-A/NK diagram(b)for quartz diorite gneissin Annanba area
图 5 安南坝花岗闪长质片麻岩稀土元素球粒陨石标准化配分图解（a）和微量元素原始地幔标准化蛛网图（b）
Fig. 5. Chondrite normalized REE patterns(a) and primitive mantle normalized spidergram(b)for quartz diorite gneiss in Annanba area, southeastern Tarim
图 6 安南坝石英闪长片麻岩锆石U-Pb年龄-εHf(t)图解（a）和两阶段Hf模式年龄分布图解（b）
Fig. 6. Zircon U-Pb age-εHf(t) diagram(a) and distribution of two-stage Hf model age diagram(b)for quartz diorite gneiss in Annanba area, southeastern Tarim
图 7 安南坝石英闪长片麻岩Rb/Ba-Rb/Sr图解（a）及Al2O3/(FeOT+MgO)-CaO/(FeOT+MgO)图解（b）
Fig. 7. Rb/Ba-Rb/Sr diagram(a) and Al2O3/(FeOT+MgO)-CaO/(FeOT+MgO) diagram(b)for quartz diorite gneiss in Annanba area
图 8 安南坝石英闪长片麻岩Harker图解
Fig. 8. Harker diagrams forquartz diorite gneiss in Annanba area, southeastern Tarim
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