Magmatism in the Pamir: tracing crustal and mantle processes

帕米尔高原的岩浆作用：追踪地壳和地幔的过程

• 批准号: 210955049
• 负责人: Professor Dr. Stefan Jung
• 金额: --
• 依托单位: Mineralogisch-Petrographisches Institut (MPI)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/210955049?language=en
• 关键词: Magmatism; Pamir; tracing; crustal; mantle

Convective thinning of ancient, enriched mantle lithosphere followed by asthenospheric rise and lithosphere melting, slab break-off, and magmatism above several intra-continental subduction zones are the current tectonic interpretations of the origin of magmatism on the Tibet plateau. Similar causes are expected for magmatism in the Pamir. Our work in the 1st phase of the TIPAGE bundle indicates 2 that the Pamir contains several Cenozoic magmatic suites that are potentially related to distinct stages of the tectonic evolution of the India-Asia collision zone. Suite A involves mafic to felsic, volcanic and plutonic rocks that likely cover 45 to 20 Ma and possibly mark long-lasting intra-continental subduction of India beneath Asia. Suite B, comprising basaltic to andesitic rocks dated at ~20 Ma, is potentially related to a phase of Indian slab-roll back. Suite C involves ~20-10 Ma potassic/ultrapotassic, intermediate to felsic rocks that may trace break-off of the Indian lithosphere and its effects on Asian continental lithosphere. In this project, we will elucidate the distribution of this magmatic activity in time and space, its petrology, nature, and geochemical composition, the composition and temporal evolution of its source regions, the melting conditions, and its genetic coupling to the deformation and metamorphic history associated with intra-continental subduction, crustal thickening, extension, and exhumation; all aspects that we address in the other subprojects. Our goal is a full integration of the magmatic evolution and the information it provides on crust and mantle into the geodynamic scenarios developed in TIPAGE; we also will attempt a correlation with magmatism in Tibet. Methodically, we will employ magmatic petrology combined with major and trace element as well as Sr-Nd-Pb and Hf isotope geochemistry along with local high-resolution geochronology (U-Th-Pb and Ar-Ar techniques).

在几个几个群内俯冲区之上，古代，富集地幔岩石圈的对流稀疏，然后是微弱的上升和岩石圈融化，平板爆裂和岩浆症，是对墨玛高原上岩浆作用的当前构造解释。帕米尔（Pamir）的岩浆作用预计会发生类似的原因。我们在尖端束的第一阶段的工作表明2，Pamir包含了几个与印度亚洲碰撞区构造演化的不同阶段有关的新生代岩浆套件。 A套房A涉及镁铁质，可能覆盖45至20 MA的Felsic，火山岩和岩石岩石，并可能标志着亚洲下方印度的持久持久内俯冲。 B套房B，包括约20 mA的玄武岩到安第斯山脉的岩石，可能与印度平板背部的阶段有关。套房C涉及约20-10 Ma钾盐/超阶层，中间至可能追踪印度岩石圈的破裂及其对亚洲大陆岩石圈的影响。在这个项目中，我们将阐明这种岩浆活性在时空，岩石学，自然和地球化学组成，其源区域的组成和时间演变，熔融条件及其遗传耦合与变形和变质的遗传耦合的分布与大陆俯冲，地壳增厚，延伸和发掘有关的历史；我们在其他子弹中解决的所有方面。我们的目标是将岩浆进化的完整整合及其在地壳和地幔上提供的信息中，以在小费中开发的地球动力学情景中；我们还将尝试与西藏中的岩浆作用相关。有条理地，我们将采用岩浆岩石学结合主要和痕量元素，以及SR-ND-PB和HF同位素地球化学以及局部高分辨率地质学（U-TH-PB和AR-AR技术）。

项目成果

Building the Pamir‐Tibet Plateau—Crustal stacking, extensional collapse, and lateral extrusion in the Pamir: 3. Thermobarometry and petrochronology of deep Asian crust

• DOI: 10.1002/2017tc004488
• 发表时间: 2017-09
• 期刊: Tectonics
• 影响因子: 4.2
• 作者: B. Hacker;L. Ratschbacher;D. Rutte;M. Stearns;Nicole Malz;K. Stübner;A. Kylander‐Clark;J. Pfänder;Alexa Everson

Building the Pamir‐Tibetan Plateau—Crustal stacking, extensional collapse, and lateral extrusion in the Central Pamir: 2. Timing and rates

• DOI: 10.1002/2016tc004294
• 发表时间: 2017-03
• 期刊: Tectonics
• 影响因子: 4.2
• 作者: D. Rutte;L. Ratschbacher;J. Khan;K. Stübner;B. Hacker;M. Stearns;E. Enkelmann;R. Jonckheere;J. Pfänder;B. Sperner;M. Tichomirowa

Building the Pamir‐Tibetan Plateau—Crustal stacking, extensional collapse, and lateral extrusion in the Central Pamir: 1. Geometry and kinematics

• DOI: 10.1002/2016tc004293
• 发表时间: 2017-03
• 期刊: Tectonics
• 影响因子: 4.2
• 作者: D. Rutte;L. Ratschbacher;S. Schneider;K. Stübner;M. Stearns;M. A. Gulzar;B. Hacker

Foundering Triggered by the Collision of India and Asia Captured in Xenoliths

包体中捕捉到的印度和亚洲碰撞引发的崩溃

• DOI: 10.1002/2017tc004704
• 发表时间: 1933
• 期刊: Tectonics
• 影响因子: 4.2
• 作者: Shaffer;Hacker;Ratschbacher;Kylander‐Clark
• 通讯作者: Kylander‐Clark