Bulletin of the Mineral Research and Exploration (BMRE)
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MICROTHERMOMETRIC CHARACTERISTICS OF THE OXIDIZED TYPE W-SKARN, IN SUSURLUK, BALIKESIR, TURKEY
No full textThe Susurluk skarn deposit developed at the contacts the Çataldağ Granitoid and Mesozoic carbonate rocks is represented by endo and exoskarn (proximal zone, distal zone and vein skarn) zones. The endoskarn zone which occurs in a limited area is characterized by clinopyroxene, plagioclase, sphene, orthoclase and quartz minerals. The exoskarn zone is composed mainly of clinopyroxene, vesuvianite, wollastonite and some accessory minerals such as calcite, quartz, plagioclase, orthoclase, scapolite, biotite, muscovite, sphene and chlorite and ore minerals of scheelite, chalcopyrite and bornite. The presence of anhydrous minerals such as garnet and clinopyroxene is indicative of prograde stage, and the absence of hydrous minerals such as epidote, amphibole and biotite indicates that retrograde stage was not developed. Microthermometric data on exoskarn zone reveal that boiling at temperatures of 587°-592°C took place at the first stage of skarnization. Solutions of the first stage in which scheelite mineralization occurred are characterized by homogenization temperatures of 587 to 600°C and salinity range of 11-16 wt% NaCI equivalent. At the second stage of skarnization, homogenization temperatures and salinities were recorded as 371 to 600°C and 36 to \u3e70 wt% NaCI equivalent, respectively. High salinity values are attributed to boiling phenomenon. The Te values of fluid inclusions may indicate a solution composition of CaCl2+NaCl+KCl+H2O and significant amount of carbonic additions to the system, CO2 (Te: -66 to -58°C) and CH4 (Te: -188 to -178°C). The Susurluk skarn deposit wh
INVESTIGATIONS OF ALTERATION ZONES BASED ON FLUID INCLUSION MICROTHERMOMETRY AT SUNGUN PORPHYRY COPPER DEPOSIT, NW IRAN
No full textThe Sungun porphyry copper deposit is located in East Azerbaijan, NW of Iran. The porphyries occur as stocks and dikes ranging in composition from quartz monzodiorite to quartz monzonite. Four types of hypogene alteration are developed; potassic, phyllic, propylitic and argillic. Three types of fluid inclusions are typically observed at Sungun; (1) vapor-rich, (2) liquid-rich and (3) multi-phase. Halite is the principal solid phase in the latter. The primary multiphase inclusions within the quartz crystals were chosen for micro-thermometric analyses and considered to calculate the geological pressure and hydrothermal fluid density. In potassic zone, the average of homogenization temperature is 413.6°C while in phyllic alteration, 375.9 °C. As expected in potassic alteration, the temperature of hydrothermal solutions is higher than that in phyllic zone. The salinity of the hydrothermal fluids has a high coherency with homogenization temperature, so the average of salinity in potassic samples is 46.3 (wt% NaCl) which is higher than phyllic samples. Based on the location of potassic alteration, as expected, the lithostatic pressure is much more than the phyllic one. Finally, the average density of hydrothermal fluids in the potassically altered samples is 1.124 (gr/cm3 ) which is higher than the ones in phyllic zone (1.083 gr/cm3 )
GEOLOGY OF THE EARLY MIOCENE ALAÇAMDAĞ (DURSUNBEY-BALIKESİR) MAGMATIC COMPLEX AND IMPLICATIONS FOR THE WESTERN ANATOLIAN EXTENSIONAL TECTONICS
No full textExtensional regime in western Anatolia caused development of metamorphic core complexes, NEand E-W-trending basins and emplacement of magmatic rocks since Late Oligocene and Early Miocene. The Alaçamdað magmatic complex, which is located to the west of the Simav metamorphic core complex, includes significant data that highlight the style of extensional regime in western Turkey. It consists of Early Miocene granitic intrusions and volcanic rocks with variable compositions ranging from basalt to rhyolite. The granitic intrusions that were emplaced into the basement rocks of the Menderes Massive and Ýzmir-Ankara Zone are divided into two facies based on their lithological and textural characteristics: Musalar and Alaçam granites. The Musalar granite has typical holocystalline equigranular texture, while the Alaçam granite is characterised by its porphyritic texture defined by abundant K-feldspar megacrysts. Both granite units were locally transformed into mylonites along shear zones. Volcanic rocks consist of Saðýrlar volcanic unit and felsic volcanic rocks. Saðýrlar volcanic unit is made up of andesitic/dacitic intrusions, domes, lava flows, dykes and volcanogenic sedimentary rocks. The felsic volcanic rocks, which unconformably overlies the Saðýrlar volcanic unit, consist of ignimbrite, dacite and rhyolite. These rocks have transitional contacts with alluvial/lacustrine sedimentary deposits. Ductile deformation on the granitic rocks, intra-basinal unconformities and syn-sedimentary deformational structures within the deposits are closely associated with the development of extensional regime during Early Miocene in western Turkey
PRELIMINARY FINDINGS ON THE FOSSIL TRACES IN THE MASSIVE SULPHITE DEPOSITS OF EASTERN BLACK SEA REGION (LAHANOS, KILLIK AND ÇAYELI)
No full textTube worm fossils have been found in the Upper Cretaceous aged massive sulfide deposits of the Eastern Black Sea Region. Similar ones of these tube worm fossils have been found in the massive sulfide deposits of Umman, Cyprus, Ireland and Urals. This fossil community defined in very few massive sulfide deposits in the world is the important evidences of the sea floor hydrothermal vents in Pontids. These worm-like forms can be considered as the ancestral forms of the unusual vent communities defined in places where modern hydrothermal vents are observed such as East Pacific Rise, Galapagos and Juan de Fuca Ridge
INVESTIGATION OF CRUSTAL STRUCTURE OF TURKEY BY MEANS OF GRAVITY DATA
No full textDuring this work, the regional gravity data acquired earlier were used and in order to investigate the relations between geology - tectonics and elevation, isostatic map of Turkey, free air anomaly map and Bouguer anomaly maps were obtained, and comparisons with respect to elevations were carried out. For the thickness of the earth crust T 0 32 - 0.08g relation was used. The best relation was obtained from Bouguer anomaly with +0.65 coefficient; the relation function was obtained as Y = - 72E + 7.77. Thickness of the crust of Turkey is estimated to be 31.4 km where it is the shallowest and 50 km where it is deepest
ANALYSIS OF DENİZLİ EARTHQUAKES ACCORDING TO THEIR ACTIVITY AND CUMULATIVE ACTIVITY TERMS
No full textCOASTAL SALT WEATHERING OF QUATERNARY EOLIANITE (BOZCAADA ISLAND) AND EOCENE SANDSTONE (GELİBOLU PENINSULA): THE CONTRIBUTION OF MICROANALYTICAL DATA
No full textPETROGRAPHICAL AND GEOCHEMICAL PROPERTIES OF PLAGIOGRANITES AND GABBROS IN GULEMAN OPHIOLITE
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