必须声明标量变量 "@Script_ID"。 柴北缘鱼卡河超高压变质金红石中Si含量及其地质意义-《地球科学与环境学报》
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[1]孙慧,陈丹玲*,任云飞,等.柴北缘鱼卡河超高压变质金红石中Si含量及其地质意义[J].地球科学与环境学报,2020,42(02):215-230.[doi:10.19814/j.jese.2019.12011]
 SUN Hui,CHEN Dan-ling*,REN Yun-fei,et al.Si Contents and Their Geological Significance of Yukahe Ultrahigh-pressure Metamorphic(UHPM)Rutile in the Northern Qaidam Basin, NW China[J].Journal of Earth Sciences and Environment,2020,42(02):215-230.[doi:10.19814/j.jese.2019.12011]
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柴北缘鱼卡河超高压变质金红石中Si含量及其地质意义(PDF)
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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第42卷
期数:
2020年第02期
页码:
215-230
栏目:
基础地质与矿产地质
出版日期:
2020-03-15

文章信息/Info

Title:
Si Contents and Their Geological Significance of Yukahe Ultrahigh-pressure Metamorphic(UHPM)Rutile in the Northern Qaidam Basin, NW China
文章编号:
1672-6561(2020)02-0215-16
作者:
孙慧12陈丹玲12*任云飞12王海杰12
(1. 西北大学 大陆动力学国家重点实验室,陕西 西安 710069; 2. 西北大学 地质学系,陕西 西安 710069)
Author(s):
SUN Hui12 CHEN Dan-ling12* REN Yun-fei12 WANG Hai-jie12
(1. State Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, Shaanxi, China; 2. Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China)
关键词:
金红石 榴辉岩 石榴角闪钠长岩 超高压变质作用 LA-ICP-MS原位分析 微量元素 柴达木盆地北缘
Keywords:
Key words:rutile eclogite garnet amphibole albitite ultrahigh-pressure metamorphism in-situ LA-ICP-MS analysis trace element the northern Qaidam Basin
分类号:
P578.4+7
DOI:
10.19814/j.jese.2019.12011
文献标志码:
A
摘要:
利用LA-ICP-MS方法对柴达木盆地北缘鱼卡河超高压变质的多硅白云母榴辉岩及共生的石榴角闪钠长岩中的金红石进行了详细的矿物学和LA-ICP-MS原位微量元素研究。结果表明:多硅白云母榴辉岩中金红石显示Si成分环带,且Si含量(质量分数,下同)随变质压力而发生规律性的变化; 从进变质到峰期变质阶段,金红石中Si含量从核部向边部呈升高趋势,峰期金红石的边部Si含量达到最高,退变质阶段金红石中Si含量从核部向边部呈降低趋势; 石榴角闪钠长岩中的金红石主要呈包体产于多硅白云母、石榴子石、角闪石和钠长石中; 在相同的超高压变质条件下,石榴角闪钠长岩中多硅白云母包体金红石的Si含量((1 018~2 741)×10-6,平均为1 924×10-6)明显高于多硅白云母榴辉岩中的峰期金红石((450~2 397)×10-6,平均为952×10-6)。综合多硅白云母榴辉岩和石榴角闪钠长岩的产状、变质演化和全岩成分以及前人对大别—苏鲁超高压榴辉岩中富硅金红石的研究结果提出,超高压变质岩石中金红石的Si含量与变质压力成正相关关系,金红石中Si含量大于500×10-6可以作为榴辉岩经历超高压变质作用的指示标志。超高压金红石中Si含量与全岩成分中SiO2和TiO2含量有关,随SiO2含量的升高和TiO2含量的降低而升高。
Abstract:
An integrated study of mineralogy and in-situ LA-ICP-MS trace element analysis was conducted on rutiles from Yukahe ultrahigh-pressure metamorphic(UHPM)phengite eclogite and garnet amphibole albitite in the northern Qaidam Basin, NW China. The results show that rutiles from these two UHPM rocks have high Si contents, and during the metamorphic evolution of phengite eclogite, Si contents of rutile grains grown in different metamorphic stages as well as the core and rim parts of a single rutile grain change regularly with metamorphic pressure. The Si contents in prograde rutiles, which occur as inclusions in garnet, omphacite and phengite core, increase gradually from core((342-360)×10-6)to rim; the Si contents in peak rutiles, which coexist with garnet, omphacite and phengite in matrix or occur as inclusions in garnet mantle and rim, have the highest Si contents with an average value of 952×10-6 and a maximum value of 2 397×10-6; the Si contents in retrograde rutiles, which coexist symplectite with amphibole+plagioclase formed by omphacite decomposition or occur in phengite+quartz veins of eclogite, decrease gradually from core towards rim(the average Si content of symplectite is 726×10-6, and that of microveins is 674×10-6). Rutiles in garnet amphibole albitite mainly occur as inclusions in phengite, garnet, amphibole and albite, and the rutiles in different occurrences have obviously higher Si contents(1 808×10-6 on average)than those from phengite eclogite(762×10-6 on average). In which, the rutiles included in phengite have Si contents of(1 018-2 741)×10-6 with an average value of 1 924×10-6, whereas the rutiles hosted by albite have variable Si contents of(685-3 910)×10-6 with an average value of 1 761×10-6. Combined with the occurrences, metamorphic evolutions and whole rock compositons of phengite eclogite and garnet amphibole albitite as well as the previous results on Si-bearing rutiles of ultrahigh-pressure eclogites in Dabie-Sulu orogenic belt, it is proposed that Si contents of rutiles from UHPM rocks are positively correlated with metamorphic pressure, and the rutiles with high-Si content(>500×10-6)may be a fingerprint for eclogite experiencing ultrahigh-pressure metamorphism; the whole rock SiO2 and TiO2 contents affect the Si contents of rutiles under the same ultrahigh metamorphic pressure, and the Si contents of rutiles increase as whole SiO2 rises and TiO2 decreases.

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备注/Memo

备注/Memo:
收稿日期:2019-12-10; 修回日期:2020-02-07; 网络首发日期:2020-03-13投稿网址:http:∥jese.chd.edu.cn/
基金项目:国家自然科学基金项目(41972058,41802056)
作者简介:孙 慧(1993-),女,江苏常州人,理学硕士研究生,E-mail:sun.hui123@foxmail.com。
*通讯作者:陈丹玲(1967-),女,陕西丹凤人,教授,博士研究生导师,理学博士,E-mail:dlchen@nwu.edu.cn。
更新日期/Last Update: 2020-03-24