نتایج جستجو برای: hydrothermal fluids
تعداد نتایج: 59909 فیلتر نتایج به سال:
There has been an increasing interest in seafloor exploitation such as mineral mining in deep-sea hydrothermal fields, but the environmental impact of anthropogenic disturbance to the seafloor is poorly known. In this study, the effect of such anthropogenic disturbance by scientific drilling operations (IODP Expedition 331) on seabed landscape and megafaunal habitation was surveyed for over 3 y...
bentonite deposits of economic interest are widespread in tashtab mountains (khur), east of isfahan province, iran. several bentonite deposits have been developed in this area as a result of eocene volcanic alteration. these deposits are classified as khur bentonite horizon. xrd analyses reveal that alteration products consist of na-montmorillonite, kaolinite, quartz, calcite, and crystobalite....
The Hizeh-Jan kaolin deposit (NW Varzaghan, East-Azarbaidjan Province) is a typical clayey deposit with andesitic host of Eocene age in northwestern Iran. Based on XRD analyses, the minerals of this deposit include kaolinite, pyrophyllite, quartz, smectite, muscovite-illite, hematite, goethite, anatase, alunite, diaspore, feldspar, hornblende, and calcite. Increasing SiO2/Al2O3 ratio from the c...
Nezamabad region is a part of Boroujerd granitoid comple)( (western Iran) which has been cut by various quartz-tourmaline veins with appro)(imately 0,5 to 2 m thickness, Mineralogical and electron microprobe analyses of the tourmalines in those veins and quartzdioritic host rock show that they are schor! and dravite one in terms of composition (with a general tendency toward dravite end me...
3 Alexander Y. Merkel#, Julie A. Huber , Nikolay A. Chernyh, 4 Elizaveta A. Bonch-Osmolovskaya, Alexander V. Lebedinsky 5 6 Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospekt 60-Letiya 7 Oktyabrya 7/2, 117312 Moscow, Russia, and Josephine Bay Paul Center, Marine Biological 8 Laboratory, 7 MBL Street, Woods Hole, MA 02543, USA 9 10 Running title: Thermophilic ANMEs in d...
Based on the field observations host rock of tourmaline nodules in the Dehgah and Sarsakhti area are acidic dikes (Aplite) and monzogranite respectively. In these areas, nodules composed of tourmaline, quartz, alkali-feldspar, but leuco minerals component in Dehgah nodule are less than Sarsakhti area. The negative anomaly of Eu, enrichment in the light REE (LREE), decrease of HREE, and fractio...
[1] The Deep Ocean Raman In Situ Spectrometer (DORISS) instrument was deployed at the Sea Cliff Hydrothermal Field and Hydrate Ridge in July 2004. The first in situ Raman spectra of hydrothermal minerals, fluids, and bacterial mats were obtained. These spectra were analyzed and compared to laboratory Raman measurements of standards and samples collected from the site. Spectra of vent fluid ( 29...
the data obtained from field and geothermometric studies and also the ree composition of fluorites associated with lead mineralization at the kamar-mehdi mine are compatible with a structurally controlled, fissure filling, epigenetic, hydrothermal origin. homogenization and last ice melting temperatures for primary fluid inclusions trapped in fluorite crystals indicate that the mineralization o...
Introduction: Fluid inclusion studies have the potential to record various important features of impact sites including the heating effects due to impact, hydrothermal fluid circulation history, the subsequent behavior of exposed rocks at the planetary surface and, of most interest to astrobiology, the preservation of organic matter [1, 2, 3]. “Water is of interest not only from the perspective...
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