As many of the methanogens first encountered at hydrothermal vents were thermophilic to hyperthermophilic and comprised one of the lower roots of the evolutionary tree, it has been assumed that methanogenesis was one of the earliest, if not the earliest, pathway to life. It being well known that hydrothermal springs associated with serpentinization also bore abiotic methane, it had been further...

Abstract
 Administratively, the research area is included in North Morowali Regency, Central Sulawesi Province, Java which 49 S zone with UTM (Universal Transverse Mercator) coordinates 9152800 – 400800 - 406800 mE an of ​​± 54 km2 (9 km x 6 km). ). One factors that influence formation laterite nickel deposits source rock. The purpose this to focus on characteristics original rock, namely ...

Serpentinization of ultramafic rock can generate conditions favorable for microbial methane (CH 4 ) cycling, including the abiotic production hydrogen (H 2 and possibly CH . Systems low-temperature serpentinization are geobiological targets due to their potential harbor life ubiquity throughout Earth’s history. Biomass in fracture waters collected from Samail Ophiolite Oman, a system undergoing...

The occurrence and genesis of Ca(OH)2 and Mg(OH)2 deposits associated with hyperalkaline groundwater from partly serpentinized ultramafic rocks in Northern Oman is reported. Two types of Ca(OH)2 deposit are differentiated; crystalline portlandite formed by the evaporation of Ca 2 + 2 O H spring waters, and a form of amorphous gel, not previously known in nature. The latter is a product of prese...

baft ophiolite mélange is a part of naein-baft ophiolite (southeast of kerman province in iran). serpentinites from baft ophiolite mélange contain different types of spinels such as chromite, chromespinel, ferritchromite and magnetite which can reveal different stages of evolution in host serpentinites. the compositions of baft chromites show that they belong to podiform chromitites that may ha...

Hydrous alteration of olivine is capable of producing molecular hydrogen (H2) under a wide variety of hydrothermal conditions. Although olivine hydrolysis (i.e., serpentinization) has commonly been assessed at elevated temperatures (4100 1C), the nature of these reactions in relation to H2 production at lower temperatures has not been systematically evaluated, especially with regard to carbonat...