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Collaborative Research: Petrotectonic Study of Ultrahigh-Pressure Rocks From the Kokchetav Massif, Northern Kazakhstan, and the Maksyutov Complex...

合作研究：哈萨克斯坦北部 Kokchetav 地块和 Maksutov 杂岩超高压岩石的岩石构造研究...

基本信息

批准号：
9725346
负责人：
Douglas Rumble
金额：
$ 2.8万
依托单位：
Carnegie Institution of Washington
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-07-01 至 2000-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9725346&HistoricalAwards=false
关键词：
Collaborative Research Petrotectonic Study Ultrahigh

项目摘要

9725346 Rumble This proposed U.S.-Japan-Russia-Kazakhstan cooperative project will continue field, petrologic, stable, isotopic, geochronologic, and tectonic investigations of intracratonal ultrahigh-pressure and high-pressure metamorphic rocks in the Kokchetav Massif and the Maksyutov Complex, where coesite ( microdiamonds have been described. Primary objectives are to: (1) determine the regional distribution and structural relationships among diamond-bearing gneiss and marble, coesite-bearing eclogite and gneiss, and other UHP and HP rocks in the Kokchetav Massif and the Maksyutov Complex; (2) identify and characterize the mineral inclusions in garnet and zircon from eclogite, gneiss, marble, and schist to establish conditions of UHP metamorphism and the effect of such elevated pressures; (3) delineate mineral parageneses and P-T-t paths for eclogite, whiteschist, garnet peridotite, blueschist, gneiss and marble; (4) characterize 18O/16O ratios of silicates and carbon isotopes of diamond, magnesite, and other carbonates in order to evaluate the role of fluids at mantle depths; (5) determine the structural and geochemical characteristics of protoliths in order to infer their plate tectonic settings; (6) establish the ages of blueschist, eclogite, and retrograde metamorphism through U-Pb and 40Ar/39Ar dating; and (7) compare findings from central Asia with those from eastern China in order to elucidate the genetic relationships among recognized metamorphic, igneous, and tectonic features.

这个提议的美、日、俄、哈合作项目将继续对Kokchetav地块和Maksyutov杂岩进行野外、岩石学、稳定学、同位素、地质年代学和构造研究，在这些地区已经发现了微钻石。主要目的是：(1)确定科科切塔夫地块和马克苏托夫杂岩中含金刚石片麻岩和大理岩、含硅榴辉岩和片麻岩以及其他超高压和高压岩石的区域分布和构造关系；(2)对榴辉岩、片麻岩、大理岩和片岩中石榴石和锆石中的矿物包裹体进行鉴定和表征，确定超高压变质作用的条件和高压作用的影响；(3)圈定了榴辉岩、白片岩、石榴石橄榄岩、蓝片岩、片麻岩和大理石的共生矿物和P-T-t路径；(4)表征硅酸盐的18O/16O比值以及金刚石、菱镁矿和其他碳酸盐的碳同位素，以评价流体在地幔深处的作用；(5)确定原岩的构造和地球化学特征，推断其板块构造背景；(6)通过U-Pb测年和40Ar/39Ar测年确定蓝片岩、榴辉岩和逆变质岩的年龄；(7)比较中亚与中国东部的发现，以阐明已确认的变质、火成岩和构造特征之间的成因关系。