Journal ArticleDOI
Igneous Geochemistry of Mineralized Rocks of the Baguio District, Philippines: Implications for Tectonic Evolution and the Genesis of Porphyry-Style Mineralization
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TLDR
The Baguio district of the Philippines is one of the world's premier mineral provinces, containing >35 million Moz of gold and 2.7 million metric tons of copper in epithermal, porphyry, and skarn deposits that formed in the last 3.5 m.y. as mentioned in this paper.Abstract:
The Baguio district of the Philippines is one of the world’s premier mineral provinces, containing >35 million
ounces (Moz) of gold and 2.7 million metric tons (Mt) of copper in epithermal, porphyry, and skarn deposits
that formed in the last 3.5 m.y. Pliocene and Pleistocene magmatic rocks of the Baguio district that are
spatially and temporally associated with mineralization can be broadly subdivided into an intermediate to felsic
suite of mineralized low to medium K intrusions, some of which have adakitic affinities and a suite of mafic
to intermediate, medium K to shoshonitic hornblende-phyric dikes. The geochemical and isotopic characteristics
of the dikes are consistent with primitive mantle-derived melts that underwent minimal crustal contamination
as they ascended through the arc crust. In contrast, the intermediate to felsic suite has been contaminated
by young arc crust, suggesting ponding and fractionation within shallow-crustal magma chambers.
The Philippine arc has formed in a complex tectonic environment and is currently sandwiched between two
active subduction zones. Eastward-directed subduction of the Scarborough Ridge along the Manila trench is
currently associated with flattening of the downgoing slab. The formation of the Mafic dike complex is broadly
coeval with the onset of subduction of the Scarborough Ridge and slab flattening. The extinct Scarborough
Ridge would have been younger than the downgoing plate and consequently more susceptible to melting.
These melts can account for the isotopic recharge of the Pliocene subarc mantle as well as the generation of
the primitive melts and adakitic rocks found within the Baguio district. The interaction between primitive
mafic melts and the more felsic calc-alkaline rocks hasread more
Citations
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Journal ArticleDOI
Exploration Tools for Linked Porphyry and Epithermal Deposits: Example from the Mankayan Intrusion-Centered Cu-Au District, Luzon, Philippines
Zhaoshan Chang,Jeffrey W. Hedenquist,Noel C. White,David R. Cooke,Michael Roach,Cari L. Deyell,Joey Garcia,J. Bruce Gemmell,Stafford McKnight,Ana Liza G. Cuison +9 more
TL;DR: In this paper, an airborne geophysics survey indicates that the Far Southeast porphyry Cu-Au deposit is associated with a wide zone of demagnetization due to extensive magnetite-destructive phyllic alteration.
Journal ArticleDOI
Evidence for Magmatic-Hydrothermal Fluids and Ore-Forming Processes in Epithermal and Porphyry Deposits of the Baguio District, Philippines
TL;DR: The Baguio district contains a diverse array of epithermal, porphyry and skarn deposits, together with a large, broadly strata bound, advanced argillic lithocap as discussed by the authors.
Journal ArticleDOI
Large-scale porphyry-type mineralization in the Central Asian metallogenic domain: A review
Jun Gao,Reiner Klemd,Mingtian Zhu,Xin-Shui Wang,Ji-Lei Li,Bo Wan,Wenjiao Xiao,Qingdong Zeng,Ping Shen,Jing-Gui Sun,Kezhang Qin,Eduardo Campos +11 more
TL;DR: In this article, a new model was proposed to interpret the genesis of porphyry-type mineralization in the Central Asian metallogenic domain (CAMD), which is based on pre-enriched mafic lower crust and the subduction of a relictic mid-oceanic ridge.
Book ChapterDOI
Geochemistry of Porphyry Deposits
TL;DR: In this article, the authors used radiometric dating to detect multiple mineralizing episodes over several million years in some deposits and durations of less than a few hundred thousand years for magmatism and mineralization in others.
Journal ArticleDOI
Magma mixing origin for the Aolunhua porphyry related to Mo–Cu mineralization, eastern Central Asian Orogenic Belt
TL;DR: The Aolunhua porphyry complex and its related Mo-Cu deposit from the eastern Central Asian Orogenic Belt (CAOB) provide important insights into this issue as mentioned in this paper.
References
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Chemical and isotopic systematics of oceanic basalt : implications for mantle composition and processes
TL;DR: In this article, trace-element data for mid-ocean ridge basalts and ocean island basalts are used to formulate chemical systematics for oceanic basalts, interpreted in terms of partial-melting conditions, variations in residual mineralogy, involvement of subducted sediment, recycling of oceanic lithosphere and processes within the low velocity zone.
Journal ArticleDOI
Chemical and isotopic systematics of oceanic basalts. Implications for Mantle Composition and Processes
Journal ArticleDOI
A model for Trondhjemite-Tonalite-Dacite Genesis and crustal growth via slab melting: Archean to modern comparisons
Mark S. Drummond,Marc J. Defant +1 more
TL;DR: In this paper, the authors introduced the importance of subducted oceanic crustal age on arc petrogenesis and demonstrated that Archean TTD crustal generation processes are also present in selected high-Al Phanerozoic TTD terranes.
Journal ArticleDOI
Petrology and geochemistry of Camiguin Island, southern Philippines: insights to the source of adakites and other lavas in a complex arc setting
TL;DR: Camiguin is a small volcanic island located 12 km north of Mindanao Island in southern Philippines as mentioned in this paper, which is the most likely source of Camiguin and most CMA magmas is the mantle wedge metasomatized by fluids dehydrated from a subducted slab.
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