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Geochemical Characterization of Hydrothermal Alteration in the Eocene Scatter Creek Formation, Republic, Washington.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Geochemical Characterization of Hydrothermal Alteration in the Eocene Scatter Creek Formation, Republic, Washington./
作者:	Stanfield, Jonathan C.
面頁冊數:	1 online resource (312 pages)
附註:	Source: Masters Abstracts International, Volume: 84-04.
Contained By:	Masters Abstracts International84-04.
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29066042click for full text (PQDT)
ISBN:	9798845412430

Geochemical Characterization of Hydrothermal Alteration in the Eocene Scatter Creek Formation, Republic, Washington.
Stanfield, Jonathan C.

Geochemical Characterization of Hydrothermal Alteration in the Eocene Scatter Creek Formation, Republic, Washington. - 1 online resource (312 pages)

Source: Masters Abstracts International, Volume: 84-04.

Thesis (M.S.)--Washington State University, 2022.

Includes bibliographical references

Hydrothermal alteration is widespread in a series of Eocene intermediate dikes and sills known as the Scatter Creek Formation, which are hosted in Permian-Triassic sedimentary rocks across the Republic Graben, in northeastern Washington. Input of multiple magmas during regional extension resulted in a complex unit of variable texture and composition. These intrusions have been interpreted as conduits for hydrothermal ore mineralization via geochemical interaction with contact metamorphosed sediments. However, mineral exploration has not accounted for the widespread propylitic alteration often seen in conjunction with orebodies. As such, this study provides new analyses dedicated to the distribution of geochemical signatures and hydrothermal alteration minerals in the Scatter Creek Formation, with a broader goal of linking surface observations to a possible source as a case study for future exploration.Hand sample and thin section observations, along with electron microprobe, whole rock major and trace element, and X-ray diffraction analyses suggest that the Scatter Creek Formation geochemically links intrusive and extrusive equivalent rocks. However, hydrothermal alteration has resulted in feldspar albitization and mafic minerals reacting to magnetite-epidote-calcite-chlorite-pyrite; vesuvianite, barite, and zeolites are sometimes present. Chloritization is widespread and varies in iron content. Coarse quartz is mainly an alteration phase. Unreacted igneous minerals include rutile, zircon, sphene, pyroxene, and magnetite-ilmenite with occasional inclusions of Pb- Ni- sulfides; REE's were also detected. Alteration had little effect on non-alkalic oxide and trace element concentrations, but elevated concentrations of As and Sb possibly relate to Au mineralization. Stable oxygen and carbon isotope ratios do not show strict connections to hydrothermal alteration progress but do relate to proximity with nearby replacement ore bodies. Continued circulation of an evolving fluid during propylitic alteration is indicated by the relation of low to high isotopic ratios with achieved reaction progress.These observations are consistent with a distal propylitic alteration shell resulting from interactions of magmatic and meteoric water surrounding a magma body, which served as a heat source to drive the hydrothermal system. As such, widespread propylitic alteration in the Scatter Creek Formation, in association with Au-mineralization, suggests that a porphyry-type deposit may lie at depth in a hidden parent intrusion.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798845412430Subjects--Topical Terms:

516570
Geology.
Subjects--Index Terms:

Geochemical characterizationIndex Terms--Genre/Form:

542853
Electronic books.

Geochemical Characterization of Hydrothermal Alteration in the Eocene Scatter Creek Formation, Republic, Washington.
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520 $a Hydrothermal alteration is widespread in a series of Eocene intermediate dikes and sills known as the Scatter Creek Formation, which are hosted in Permian-Triassic sedimentary rocks across the Republic Graben, in northeastern Washington. Input of multiple magmas during regional extension resulted in a complex unit of variable texture and composition. These intrusions have been interpreted as conduits for hydrothermal ore mineralization via geochemical interaction with contact metamorphosed sediments. However, mineral exploration has not accounted for the widespread propylitic alteration often seen in conjunction with orebodies. As such, this study provides new analyses dedicated to the distribution of geochemical signatures and hydrothermal alteration minerals in the Scatter Creek Formation, with a broader goal of linking surface observations to a possible source as a case study for future exploration.Hand sample and thin section observations, along with electron microprobe, whole rock major and trace element, and X-ray diffraction analyses suggest that the Scatter Creek Formation geochemically links intrusive and extrusive equivalent rocks. However, hydrothermal alteration has resulted in feldspar albitization and mafic minerals reacting to magnetite-epidote-calcite-chlorite-pyrite; vesuvianite, barite, and zeolites are sometimes present. Chloritization is widespread and varies in iron content. Coarse quartz is mainly an alteration phase. Unreacted igneous minerals include rutile, zircon, sphene, pyroxene, and magnetite-ilmenite with occasional inclusions of Pb- Ni- sulfides; REE's were also detected. Alteration had little effect on non-alkalic oxide and trace element concentrations, but elevated concentrations of As and Sb possibly relate to Au mineralization. Stable oxygen and carbon isotope ratios do not show strict connections to hydrothermal alteration progress but do relate to proximity with nearby replacement ore bodies. Continued circulation of an evolving fluid during propylitic alteration is indicated by the relation of low to high isotopic ratios with achieved reaction progress.These observations are consistent with a distal propylitic alteration shell resulting from interactions of magmatic and meteoric water surrounding a magma body, which served as a heat source to drive the hydrothermal system. As such, widespread propylitic alteration in the Scatter Creek Formation, in association with Au-mineralization, suggests that a porphyry-type deposit may lie at depth in a hidden parent intrusion.
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650 4 $a Geochemistry. $3 539092
650 4 $a Mining. $3 3544442
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653 $a Propylitic alteration
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