well exposed famennian, mainly carbonate rocks of the bahram formation in the vicinity of bagher abad village, central iran,yielded chondrichthyan teeth some sarcopterygii and actinopterygii teeth and fragments. three different genera were recognizedamong the chondrichthyan teeth represented by: phoebodus turnerae, ph. spp., deihim mansureae (m2, m3), stethacanthus sp..acanthodian and sarcopter...

Carbonates from approximately 2.3-2.1 billion years ago show markedly positive δ(13)C values commonly reaching and sometimes exceeding +10‰. Traditional interpretation of these positive δ(13)C values favors greatly enhanced organic carbon burial on a global scale, although other researchers have invoked widespread methanogenesis within the sediments. To resolve between these competing models an...

introduction the central alborz in eastern mazandaran province is host to the most important carbonate-hosted fluorite deposits in iran, such as pachi-miana, sheshroodbar, era and kamarposht. in these deposits, mineralization occurs in the upper parts of the middle triassic elika formation (vahabzadeh et al., 2009 and references therein). these deposits have long been studied, and various model...

[1] Definitive exposures of pristine, ancient crust on Mars are rare, and the finding that much of the ancient Noachian terrain on Mars exhibits evidence of phyllosilicate alteration adds further complexity. We have analyzed high-resolution data from the Mars Reconnaissance Orbiter in the well-exposed Noachian crust surrounding the Isidis basin.We focus on data from the Compact Reconnaissance I...

Abstract While the “low salinity waterflooding” (LSWF) has been praised for enhancing oil recovery from different core rocks, performance of technique in wettability environments remains unclear. The consensus is that LSWF does not work well water-wet carbonate reservoirs. main research objective was to determine effect on displacement efficiency (DE) environments. Carbonate flooding experiment...

Effective use of cerium anomalies as a redox proxy in carbonate-dominated marine settingsEffective use of cerium anomalies as a redox proxy in carbonate-dominated marine settings' Chemical Geology, vol 438, pp. 146-General rights Copyright for the publications made accessible via the Edinburgh Research Explorer is retained by the author(s) and / or other copyright owners and it is a condition o...

The study area is located about 110 kilometers southeast of Mashhad and approximately 40 kilometers southeast of Fariman. The area is considered to be a part of the central Iran zone. It includes metamorphic rocks with different protoliths consisting of pelitic, carbonate and quartz - feldspathic rocks. The metamorphism in the study area is considered to be a contact regional metamorphism with ...

introduction the iran has vast areas of karst landforms due to the relatively high carbonaceous rocks deposited during different geologic eras. karst landforms are noteworthy for investigation from many aspects. the primary importance of these regions is the considerable amount of underground water stored in karst formations. these reserves are favorable, both in quality and quantity, as natura...