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A Tale of Two Minerals: Using Isotopes and Trace Elements of Tourmaline and Zircon to Constrain Fluid and Magma Sources in Diverse Settings.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	A Tale of Two Minerals: Using Isotopes and Trace Elements of Tourmaline and Zircon to Constrain Fluid and Magma Sources in Diverse Settings./
作者:	Marcaida, Mary Mae.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
面頁冊數:	192 p.
附註:	Source: Dissertations Abstracts International, Volume: 85-06, Section: B.
Contained By:	Dissertations Abstracts International85-06B.
標題:	Boron. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30726898
ISBN:	9798381020700

A Tale of Two Minerals: Using Isotopes and Trace Elements of Tourmaline and Zircon to Constrain Fluid and Magma Sources in Diverse Settings.
Marcaida, Mary Mae.

A Tale of Two Minerals: Using Isotopes and Trace Elements of Tourmaline and Zircon to Constrain Fluid and Magma Sources in Diverse Settings. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 192 p.

Source: Dissertations Abstracts International, Volume: 85-06, Section: B.

Thesis (Ph.D.)--Stanford University, 2022.

Accessory minerals such as tourmaline and zircon typically comprise a small fraction of a given rock, yet they offer powerful insights into its history that far outweigh their size and abundance. These insights stem from their ability to incorporate a suite of elements and their isotopes that have remarkable petrogenetic utility and retain such information across a range of geologic environments. In this dissertation, I use isotopic and trace element analysis of tourmaline and zircon to constrain the sources of fluids and magmas and understand their evolution in diverse settings.Chapter 1 of this dissertation investigates the probable sources of boron-bearing fluids that gave rise to the presence of hydrothermal tourmaline within a granitic intrusion, its metamorphosed aureole, and its unaltered wallrocks. By examining tourmaline recovered from each locality, I demonstrate via boron isotopic constraints that the ultimate source of boron is the subduction-accretionary rocks of the Franciscan Complex, although its incorporation into the intrusive-metamorphic system is accomplished in various ways.Chapters 2 and 3 of this dissertation involve two related studies that utilize zircon both as a geochronometer and as a geochemical proxy to determine magmatic crystallization ages and to infer the tectonic environments within which a magma system evolved. In Chapter 2, I demonstrate that metamorphosed plutonic and volcaniclastic sedimentary "exotic" blocks within the Yuli Belt melange of Taiwan represent accreted and deeply-buried fragments of an early-middle Miocene magmatic arc that is a likely precursor to the modern Luzon Arc. This contrasts markedly with the current paradigm that these exotic blocks represent fragments of the South China Sea oceanic crust. In Chapter 3, I analyzed zircons from the late Miocene- Pleistocene Luzon Arc accreted onto the Taiwan orogen to assess the arc magmatic response to the transition from intra-oceanic subduction to arc-continent collisional regime.

ISBN: 9798381020700Subjects--Topical Terms:

544039
Boron.

A Tale of Two Minerals: Using Isotopes and Trace Elements of Tourmaline and Zircon to Constrain Fluid and Magma Sources in Diverse Settings.
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