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| 南苏鲁超高压变质带东海地区富钛榴辉岩及金红石矿的成因 | |
| 引用本文： | 王大志,张泽明,沈昆,赵旭东.南苏鲁超高压变质带东海地区富钛榴辉岩及金红石矿的成因[J].地质通报,2006,25(7):839-849. |
| 作者姓名： | 王大志 张泽明 沈昆 赵旭东 |
| 作者单位： | 1. 江苏省地勘局第六地质大队,江苏,连云港,222300 2. 中国地质科学院地质研究所,北京,100037 3. 山东省地质科学研究院,山东,济南,250013 |
| 基金项目： | 国家重点基础研究发展规划（973）项目（2003CB716501）和国家自然科学基金项目（40399142和40472036）资助.致谢：感谢许志琴院士、游振东教授、金振民院士、杨文采院士、杨经绥研究员、刘福来研究员、陈晶教授JHoefi教授JGLiou教授、肖益林博士在工作中给予的指导,感谢中国大陆科学钻探工程中心和国土资源部大陆动力学重点实验室很多同志给予的帮助. |
| 摘 要： | 苏鲁超高压变质带南部的东海地区有富Fe—Ti的钛铁矿榴辉岩和富Ti的金红石榴辉岩。富Fe—Ti榴辉岩的次要矿物主要由钛铁矿和钛磁铁矿组成，可舍少量金红石，具有很低的Si02（38．0％-42．3％）、Na20＋K20（0．48％～2．13％）和Zr、Nb、Ta、Ba、1Kb、REE含量，很高的FeO（18．24％-25．33％）、V和Co含量，并具有不同程度的LREE亏损、明显的正Eu异常；富Ti金红石榴辉岩舍有丰富的金红石和磷灰石，SiO2含量范围（38．0％-54．8％）较宽，FeO含量较低，P2O5含量较高（可达4．1％），而X-TiO2与P205含量具正相关性。相对于原始地慢岩．富Ti金红石榴辉岩具有Rb、Th、K、Nb、Pr、Nd、Eu、Ti、Lu的负异常和Ba、Sr、Zr的正异常．并具相对较高的IKEE含量，LREE富集和HREE亏损的1KEE分配型式。岩石学和地球化学特征揭示，Fe—Ti榴辉岩的原岩是变质的Fe—Ti辉长岩，是基性岩浆强烈分离结晶作用形成的超基性-基性-中酸性层状侵入体的特征组成部分。 |
| 关 键 词： | 金红石榴辉岩 Fe—Ti榴辉岩 超高压变质作用 苏北东海地区 |
| 文章编号： | 1671-2552（2006）07-0839-11 |
| 收稿时间： | 2006-03-10 |
| 修稿时间： | 2006-04-12 |
Origin of Ti-rich eclogite and ruffle deposit in the the southern Sulu UHP metamorphic belt, China. |
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| WANG Da-zhi,ZHANG Ze-ming,SHEN Kun,ZHAO Xu-dong.Origin of Ti-rich eclogite and ruffle deposit in the the southern Sulu UHP metamorphic belt, China.[J].Geologcal Bulletin OF China,2006,25(7):839-849. | |
| Authors: | WANG Da-zhi ZHANG Ze-ming SHEN Kun ZHAO Xu-dong |
| Institution: | 1.Sixth Geological Party, Jiangsu Bureau of GMED, Lianyungang 222300, Jiangsu, China;2. Institute of Geology, Chinese Academy of Geological Sciences, Bering 100037, China;3. Geological Institute of Shandong Province, Jinan 250013, Shandong, China |
| Abstract: | Ti-rich eclogites in the southern Sulu ultrahigh-pressure (UHP) metamorphic belt may be divided into two types: Fe-and Ti-rich ilmenite eclogite and Ti-rich rutile eclogite. The Fe-Ti eclogites contain abundant ilmenite and Ti-magnetite with minor rutile and have very low SiO2 (38.0-42.3%), Na2O+K2O (0.48-2.13%), Zr, Nb, Ta, Ba, Rb and total REE contents but relatively high total FeO (18.24-25.33%), V and Co contents. Their REE patterns are characterized by more or less depletion of LREE and pronounced positive Eu anomalies. The Ti-rich rutile eclogites have abundant rutile and apatite and show a wide range of SiO2 (38.0-54.8%) and relatively low FeO and high P2O5 contents (up to 4.1%); moreover, their TiO2 contents are positively correlated with P2O5 contents. Primitive mantle-normalized trace element patterns of the rutile eclogites show negative anomalies of Rb, Th, K, Nb, Pr, Nd, Eu, Ti and Lu and positive anomalies of Ba, Sr and Zr. In addition, the rutile eclogites have relatively high REE contents and LREE-enriched and HREE-depleted patterns. The petrological and geochemical characteristics mentioned above indicate that the protoliths of Fe-Ti eclogites were Fe-Ti gabbros in a layered ultramafic to mafic intrusion formed by intensive fractional crystallization of basaltic magma. |
| Keywords: | rutile eclogite Fe-Ti eclogite ultrahigh-pressure (UHP) metamorphism Donghai northern Jiangsu |
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