Manned submersible studies have delineated a large and actively growing Kuroko-type volcanogenic massive sulfide deposit 400 kilometers south of Tokyo in Myojin Knoll submarine caldera. The body is located on the caldera floor at depth 1210 to 1360 meters, has an area by 30 notably rich gold silver. discovery polymetallic this arc-front raises possibility that numerous unexplored silicic calderas elsewhere might similar deposits.

Abstract: K–Ar ages of the following porphyry Cu deposits in western Luzon arc are determined: Lobo‐Boneng (10.50.4 Ma), Santo Niño (9.50.3 Black Mountain (2.10.1 Dizon (2.50.2 Ma) and Taysan (7.30.2 Ma). Microphenocrys‐tic apatite late Cenozoic intermediate to silicic intrusions associated with contains sulfur as SO 3 detectable by electron probe microanalyzer. Sulfur is supposed have been accommodated dominantly oxidized species oxidizing hydrous magmas that generated deposits. Likewise,...

Abstract: The Santo Tomas II (Philex) deposit is a porphyry Cu‐Au deposit, located in the southern part of Baguio mineral district, Benguet Province, northern Luzon, Philippines. associated with an intrusive complex consisting four rock types that are distinguished based on petrography. They 1) post‐ore clinopyroxene‐bearing hornblende andesite porphyry, 2) ore‐generating 3) quartz diorite and 4) porphyritic diorite. K‐Ar age hydrothermal biotitization was estimated to be 1.5±0.4 Ma. A...

Research Article| August 01, 1993 Petrologic and sulfur isotopic significance of highly oxidized sulfur-rich magma Mt. Pinatubo, Philippines A. Imai; Imai 1Geological Institute, University Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan Search for other works by this author on: GSW Google Scholar E. L. Listanco; Listanco 2Earthquake 1-1-1 Yayoi, T. Fujii Author Article Information Publisher: Geological Society America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print 0091-7613 Geology...

Abstract. Java island, regarded as a classic example of island arcs, is built through multi events Cenozoic arc magmatism produced by the subduction Indian-Australian oceanic crusts along southern margin Eurasian plate. Regional crustal compositions, subducted slabs, and tectonics determined spatial-geochemical evolution regional metallogeny. Tertiary geodynamics was dominated backarc-ward migrations volcanic centers. Only after Miocene-Pliocene roll-back effects retreating slab, slab...

Abstract Weathered crust of granitic rocks two geochemically similar plutons that differ in age magmatism were investigated the Philippines. These are Cretaceous Daroctan Granite and Middle Miocene Kapoas Granitoid located Palawan Island, a part Continental Block derived from continental margin southeastern Eurasia. Both composed biotite granodiorite granite characterized as ilmenite series, high‐K calc‐alkaline, intermediate I‐ S‐types, peraluminous. Light rare earth element (LREE) content...

Abstract. Determinations of SO 3 and Cl contents igneous accessory apatite were carried out on Late Cenozoic intermediate to silicic intrusive volcanic rocks in the Japanese island arcs western Pacific rim including southwestern Kuril arc (eastern Hokkaido), Northeast Japan (southwestern Hokkaido through northeastern Honshu central Honshu), Izu‐Bonin arc, Kyushu‐Palau ridge, Southwest (northern Kyushu) northern Ryukyu (southern Kyushu). These compared those from Western Luzon Philippines,...

Age-associated methylation changes in genomic DNA have been recently reported spermatozoa, and these can contribute to decline fertility. In a previous study, we analyzed the genome-wide profiles of bull spermatozoa using human microarray identified one CpG site (CpG-1) that potentially reflects age-related changes. present cryopreserved semen samples from Japanese Black were collected at five different ages, which referred as JD1-5: 14, 19, 28, 54, 162 months, respectively, used for...

Abstract: The Lepanto Far Southeast porphyry Cu‐Au deposit is located beneath and to the southeast of enargite‐luzonite Cu–Au in Mankayan, Benguet Province, Philippines. principal orebody consists potassic alteration subjected partial retrograde chlorite that rims stock‐work quartz‐anhydrite veinlets. Fluid inclusions found stockwork quartz anhydrite biotitized center are dominated by polyphase homogenize at temperatures >500C. Sulfur isotopic thermometry applied sulfides‐anhydrite pairs...

Abstract We present the first data on bulk‐rock major and trace element compositions for a suite of eclogite‐ blueschist‐facies rocks from B antimala C omplex, I ndonesia, with aim better constraining protolith origins nature subducted crust. The eclogites can be classified into two groups: glaucophane‐rich eclogite glaucophane‐free eclogite, whereas blueschists are divided albite–epidote glaucophanite quartz–glaucophane schists. SiO 2 contents 43.3–49.6 wt%, Na O + K 3.7–4.7 wt%. show wider...

Lateral and spatial variations magnetic susceptibilities of the granitic rocks from Sulawesi, Indonesia were studied to constrain its implication for their magma genesis regional metallogenic. The susceptibility varies between 0.08 x 10-3 SI 18.58 SI, corresponding respectively ilmenite series (< 3x SI; oxidized type) magnetite (> reduced granite. This wide range result is due large variation rock types within one suite which cause a variety minerals content in rocks. Although regionally,...

Abstract The Northwest quartz-pyrite-gold veins are situated 500 m east of the Lepanto fault in Mankayan, Luzon, Philippines. Most vein mineralization is hosted by metavolcanic basement rocks at an elevation between 700 and 1,050 m. earliest stage, stage 1, characterized sphalerite + chalcopyrite pyrite ± magnetite cutting host that were altered to chlorite illite epidote. Precious metal deposition started 2 as electrum, native gold, gold-silver tellurides deposited with pyrite, quartz,...

The effects of hypobaric hypoxia on cognitive processing in humans were studied by recording event-related potentials (ERPs) from the scalp a go/no-go reaction time (RT) paradigm under various simulated high altitudes. Most subjects indicated abrupt impairment RT at RTs lengthened association with changes latency and amplitude N2-P3 components, reflecting sensory discrimination evaluation processes. Some did not suffer any up to an extremely altitude 6,000 m. In latter case, although...

Abstract Petrochemical studies were conducted on granitoids in Sibolga and surrounding areas North Sumatra, Indonesia. The presented the characteristics of A‐ I‐type ilmenite series. syenogranites from Sarudik, syenogranite, quartz syenite, alkali feldspar syenite Sibuluhan Sihaporas, monzogranites Julu are A‐type that have high SiO 2 , CaO, Al O 3 Na + K O, Rb content, a FeO/MgO ratio, low Ba, Sr, Zr content. Tukka, Adian Koting show characteristics. lower Rb, Yb, total REE (ΣREE) content...

Abstract Petrochemical characteristics of Permo‐Triassic granitoids from five regions (i) Mung Loei, (ii) Phu Thap Fah – Thep, (iii) Phetchabun, (iv) Nakon Sawan Lobburi, and (v) Rayong Chantaburi along the Loei Fold Belt (LFB), northeastern Thailand were studied. The LFB is a north–south trending 800 km fold belt that hosts several gold base‐metal deposits. consist monzogranite, granodiorite, monzodiorite, tonalite, quartz‐syenite, quartz‐rich granitoids. These are composed quartz,...

The Cretaceous Luk Ulo Complex (LUC) in Central Java, Indonesia, hosts orogenic gold-type ores with S derived from metapelite. host rock consists of accreted metapelite, metamorphosed under temperature up to 510 ± 30 °C. We investigated the textural and chemical evolution pyrite carbonaceous matter (CM), analyzed phases for trace elements (TEs) such as As, Pb, Cu, Sb, Te, Ag, Zn, Bi, Se, Hg, Au, aim documenting behavior these during prograde metamorphism evaluate implications on gold...