A short, sharp pulse of potassium-rich volcanism during continental collision and subduction

Palmer M. R.; Ersoy E. Y.; Akal C.; Uysal I.; Genc S. C.; Banks L. A.; Cooper M. J.; Milton J. A.; Zhao K. D.

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A short, sharp pulse of potassium-rich volcanism during continental collision and subduction

机译：在大陆碰撞和俯卧期期间，富含钾富钾的耐钾脉搏的短暂敏感

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Potassic volcanic rocks are characteristic of collisional tectonic zones, with recycling of continental crust playing an important role in their generation. Potassium-rich partial melts and/or fluids derived from subducted continental material initiate and/or mix with mantle-derived melts and then erupt at the surface with varying degrees of interaction with the overlying lithosphere. The details of how continental material incorporates into mantle melts are, however, uncertain. In particular, the depths from which the potassium-rich fluids and/or melts are released from the continental material and then react with the mantle-derived melts remain a subject of debate. We have measured the boron isotope composition of volcanic rocks from Western Anatolia (Turkey) that erupted between 52 and 0.1 Ma, and span the lifetime of collisional events from initial arc-type eruptions to post-collisional volcanism. These data and other geochemical indices show that ultrapotassic volcanism was mainly confined to a narrow window between ca. 20 and 15 Ma, consistent with recycling of high-pressure phengite, with the timing of the potassic volcanism coincident with slab rollback and breakoff.

机译：鹈鹕火山岩是碰撞构造区的特征，随着大陆地壳的回收，在他们的一代中发挥着重要作用。富含型陆基材料的富含钾的部分熔体和/或流体引发和/或与地幔衍生的熔体混合，然后在表面上爆发，与覆盖岩石圈不同程度的相互作用。然而，大陆材料如何包含在地幔中的细节是不确定的。特别地，富含钾的流体和/或熔体从欧式材料释放的深度，然后与地幔衍生的熔体反应仍然是辩论的主题。我们测量了从西沙洛尼亚（火鸡）的火山岩的硼同位素组成，从52到0.1 mA之间爆发，并跨越抗碰撞火山的初始弧型爆发的局部事件的寿命。这些数据和其他地球化学指数表明，超人火山主要局限于CA之间的狭窄窗口。 20和15 mA，与高压验源的再循环一致，具有平铺的时间与平板回滚和突破一致。

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《Geology》 |2019年第11期|共4页
作者
Palmer M. R.; Ersoy E. Y.; Akal C.; Uysal I.; Genc S. C.; Banks L. A.; Cooper M. J.; Milton J. A.; Zhao K. D.;
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作者单位

Univ Southampton Sch Ocean &

Earth Sci Southampton SO14 3ZH Hants England;

Dokuz Eylul Univ Muhendislik Fak Jeol Muhendisligi Bolumu TR-35160 Izmir Turkey;

Dokuz Eylul Univ Muhendislik Fak Jeol Muhendisligi Bolumu TR-35160 Izmir Turkey;

Karadeniz Tech Univ Dept Geol Engn TR-61080 Trabzon Turkey;

Istanbul Tech Univ Dept Geol Engn TR-34469 Istanbul Turkey;

Univ Southampton Sch Ocean &

Earth Sci Southampton SO14 3ZH Hants England;

Univ Southampton Sch Ocean &

Earth Sci Southampton SO14 3ZH Hants England;

Univ Southampton Sch Ocean &

Earth Sci Southampton SO14 3ZH Hants England;

China Univ Geosci Fac Earth Resources State Key Lab Geol Proc &

Mineral Resources Wuhan 430074 Peoples R China;

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正文语种 eng
中图分类地质学;
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机译：在大陆碰撞和俯卧期期间，富含钾富钾的耐钾脉搏的短暂敏感
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A short, sharp pulse of potassium-rich volcanism during continental collision and subduction

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