Collaborative Research: Petrogenesis of Jadeitite and Other High-Pressure Rocks in Serpentinites, Motagua Fault Zone, Guatemala

合作研究:危地马拉莫塔瓜断裂带蛇纹岩中硬玉和其他高压岩石的岩石成因

基本信息

  • 批准号:
    0309116
  • 负责人:
  • 金额:
    --
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2004
  • 资助国家:
    美国
  • 起止时间:
    2004-01-15 至 2008-12-31
  • 项目状态:
    已结题

项目摘要

Jadeitite-jadeite rock-is a rare material found at about ten locations worldwide, but in central Guatemala there are two distinct sources, on either side of the Motagua Fault Zone (MFZ) - the plate boundary zone separating North American and Caribbean plates. Jadeitite is sourced from serpentinites and associated with eclogite and blueschist, the markers of subduction zones. Jadeitites appear to represent high-pressure / low-temperature (HP/LT) crystallization of fluid derived from subducted ocean crust, without preservation of remnants of a protolith. Jadeitite petrogenesis represents an important geological process, but we lack a deep understanding of jadeitites, of their relationship to eclogites, blueschists, and host serpentinized peridotite, and of how they are exhumed. Recent dating of micas in HP/LT rocks show that remnants of two collisions, an 125-113 Ma Aptian one on the south side of the MFZ and a 77-65 Ma Maastrichtian. Not only is this a singular pairing of collisional belts, but the pairing of two jadeitite-bearing terranes. Moreover, the presence of abundant lawsonite eclogite south of the MFZ indicates very high pressure, low-temperature, wet processes that contrast with the more moderate mostly blueschist conditions north of the MFZ. These differing terranes offer an extraordinary opportunity to investigate the collisional environments and the processes that produce and exhume jadeitites, other HP/LT rocks, and their host serpentinites. It is anticipated that new data will enable a rigorous testing of the fluid crystallization hypothesis as well as assessment of the sources of fluid and solutes that crystallized jadeitite, altered blueschists and eclogites, and produced serpentinite and the conditions at which these multistage processes occurred. The results of this three-year investigation will include (1) additional field studies to sample and study the local geology of the newly discovered high-P/T rock occurrences in Guatemala; (2) structural/tectonic studies to understand the distribution and mechanisms of tectonic emplacement; (3) characterization of the mineralogy and petrology of the high-P/T rocks including geothermobarometric and geochemical studies; (4) modeling fluid/rock interactions; (5) constraining the rock histories using U/Pb, Sm/Nd, Rb/Sr, Ar/Ar, and fission-track methods; and (6) investigation of Nd, Sr, Pb, and S isotope systematics by TIMS on separates and by microbeam techniques to infer protoliths and to investigate fluid sourcing, partitioning, and fractionation at high P/T. This information will be integrated into both tectonic and petrogenetic models for the evolution of the Guatemalan paleosubduction zones and the formation, in particular, of jadeitites. The broader impacts of this study include the collaboration of researchers at universities and museums, involvement of students, links with archaeological studies on Middle-American jade which is jadeitite, connections between Guatemalan and U.S. researchers, outreach to both the media and the public via interviews, articles and a Museum web-site, and planning for an exhibition that will feature the scientific dimensions of jade in relation to culture and procurement.
翡翠岩是一种罕见的物质,在世界各地约有10个地点发现,但在危地马拉中部,Motawa断裂带(MFZ)两侧有两个不同的来源-分隔北美和加勒比海板块的板块边界带。翡翠岩来源于蛇纹岩,与俯冲带标志榴辉岩和蓝片岩共生。翡翠岩似乎代表了来自俯冲洋壳的流体的高压/低温(HP/LT)结晶,没有保存原始岩石的残留物。翡翠岩成岩作用是一个重要的地质过程,但我们对翡翠岩、它们与榴辉岩、蓝片岩、寄主蛇纹岩橄榄岩的关系以及它们是如何折返的缺乏深入的了解。最近对HP/LT岩石中云母的测年表明,两次碰撞的残留物是125-113 Ma的阿普提亚碰撞和77-65 Ma的马斯特里赫特碰撞。这不仅是一对独特的碰撞带,而且是两个含有翡翠岩的地体的配对。此外,MFZ以南丰富的劳钠铝石榴辉岩的存在表明了非常高的压力、低温和潮湿的过程,这与MFZ以北更温和、主要是蓝片岩的条件形成了鲜明的对比。这些不同的地体为研究碰撞环境和产生和剥离翡翠岩、其他HP/LT岩石及其寄主蛇纹岩的过程提供了一个非同寻常的机会。预计新的数据将能够对流体结晶假说进行严格的测试,并评估使翡翠岩结晶、蚀变蓝片岩和榴辉岩以及产生蛇纹岩的流体和溶质的来源以及这些多阶段过程发生的条件。这项为期三年的调查结果将包括:(1)对危地马拉新发现的高P/T岩石产状进行更多的实地研究,以采样和研究当地地质;(2)构造/构造研究,以了解构造侵位的分布和机制;(3)高P/T岩石的矿物学和岩石学特征,包括地质温压和地球化学研究;(4)模拟流体/岩石相互作用;(5)使用U/Pb、Sm/ND、Rb/SR、Ar/Ar和裂变径迹方法约束岩石历史;(6)利用TIMS分离岩系和微束技术研究高P/T时的原岩和流体的来源、分配和分馏。这些信息将被整合到危地马拉古俯冲带演化的构造和岩石成因模型中,特别是翡翠岩的形成。这项研究的更广泛影响包括大学和博物馆的研究人员的合作,学生的参与,与美洲中部翡翠玉的考古研究的联系,危地马拉和美国研究人员之间的联系,通过采访、文章和博物馆网站与媒体和公众进行接触,以及策划一个展览,展示玉石与文化和采购有关的科学层面。

项目成果

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Hans Ave Lallemant其他文献

Hans Ave Lallemant的其他文献

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{{ truncateString('Hans Ave Lallemant', 18)}}的其他基金

COLLABORATIVE RESEARCH: Geologic and GPS Strain Study: Displacement Partitioning and Arc-Parallel Extension in the Aleutian Volcanic Arc
合作研究:地质和 GPS 应变研究:阿留申火山弧的位移分区和弧平行延伸
  • 批准号:
    9714906
  • 财政年份:
    1998
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Displacement Partioning in Volcanic Arcs: Attu Island, Aleutians
火山弧的位移划分:阿留申群岛阿图岛
  • 批准号:
    9506389
  • 财政年份:
    1995
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Uplift and Exhumation of Eclogites and Blueschists in Venezuela: Constraints Based on Structural Analysis, Geothermobarometry, and Geochronology
委内瑞拉榴辉岩和蓝片岩的隆起和折返:基于结构分析、地温气压测量和地质年代学的约束
  • 批准号:
    9304377
  • 财政年份:
    1993
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Tectonic Evolution of the Chortis Block: Implications for Caribbean Tectonics
Chortis 地块的构造演化:对加勒比构造的影响
  • 批准号:
    9219384
  • 财政年份:
    1992
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Uplift and Exhumation of Eclogites and Blueschists in Venezuela: Constraints Based on Structural Analysis, Geothermobarometry, and Geochronology
委内瑞拉榴辉岩和蓝片岩的隆起和折返:基于结构分析、地温气压测量和地质年代学的约束
  • 批准号:
    9019243
  • 财政年份:
    1991
  • 资助金额:
    --
  • 项目类别:
    Continuing grant
Penrose Conference on Transpressional Tectonics of Convergent Plate Margins
汇聚板块边缘变形构造的彭罗斯会议
  • 批准号:
    9004192
  • 财政年份:
    1990
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Structural Evolution of Isla de Margarita, Venezuela
委内瑞拉玛格丽塔岛的结构演变
  • 批准号:
    8517383
  • 财政年份:
    1986
  • 资助金额:
    --
  • 项目类别:
    Standard Grant
Structure and Tectonics of the Blue Mountains Region, Ne Oregon, and Adjacent Areas in Idaho
蓝山地区、新俄勒冈州和爱达荷州邻近地区的结构和构造
  • 批准号:
    8206531
  • 财政年份:
    1982
  • 资助金额:
    --
  • 项目类别:
    Continuing grant
Origin of the Ophiolites of Eastern Oregon and Its Implica- Tion on Plate-Tectonic Models of the Late Paleozoic and Early Mesozoic Cordilleran Orogen
俄勒冈州东部蛇绿岩的起源及其对晚古生代和早中生代科迪勒拉造山带板块构造模型的意义
  • 批准号:
    7904829
  • 财政年份:
    1979
  • 资助金额:
    --
  • 项目类别:
    Continuing grant
Origin of the Ophiolites of Eastern Oregon and Its Implication on Plate-Tectonic Models of the Late Palaeozoic And Early Mesozoic Cordilleran Orogen
俄勒冈州东部蛇绿岩的成因及其对晚古生代和早中生代科迪勒拉造山带板块构造模型的意义
  • 批准号:
    7613372
  • 财政年份:
    1976
  • 资助金额:
    --
  • 项目类别:
    Standard Grant

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