Geochemistry, microfacies and diagenetic evidences for original aragonite mineralogy and open diagenetic system of Lower Cretaceous carbonates Fahliyan Formation (Kuh-e Siah area, Zagros Basin, South Iran)

Facies Interpretation, Depositional Environment and Sequence Stratigraphy of the Sartakht Formation in the Bakhshi Section, Located in Kalmard Block, East-Central Iran

“…Green algae and small foraminifera are observed in microfacies B 1 and B 2 in the euphotic zone, where the water is shallow while nutrients are abundant [23] [25]- [27]. High amount of quarzs grains in microfacies B 1 indicates that this microfacies belongs to shallow lagoon environment [23]. The presence of stenohalins such as crinoids in microfacies B 2 confirms the relation between lagoon and open marine.…”

“…The first common characteristics among microfacies of restricted lagoon environment is the presence of tranquility in their formation environment, and the second one is the high level of salinity in the depositional environment of the sediments of this group [23]. The distinctive feature of the microfacies of this group is due to the fabric type and grain size.…”

“…Microfacies A 3 consists of a limited amount of windblown, very fine-grained to silt, poorly sorted quartz. Lack of biological variation in microfacies A 4 points to the lack of appropriate ecological conditions for marine life [21]- [23]. in size, less than 5% benthic foraminifera with 0.2 mm in size and 10% poorly sorted and rounded quartz with 0.3 mm in size, all of which are located in a micritic matrix.…”

“…The distinctive feature of the microfacies of this group is due to the fabric type and grain size. Green algae and small foraminifera are observed in microfacies B 1 and B 2 in the euphotic zone, where the water is shallow while nutrients are abundant [23] [25]- [27]. High amount of quarzs grains in microfacies B 1 indicates that this microfacies belongs to shallow lagoon environment [23].…”

Facies Interpretation, Depositional Environment and Sequence Stratigraphy of the Gachal Formation in the Madbeiki Section, Kalmard Block, East Central Iran

“…This can be proven with respect to the presence of these microfacies within evaporite deposits and the presence of evaporite crystals in the dolomitic laminations of stromatolites [13] [14]. Lack of biological variation in microfacies A 4 points to the lack of appropriate ecological conditions for marine life [22]- [24]. The presence of fenestral fabric and intraclasts in microfacies A 5 confirms that this microfacies has been formed within upper intertidal subenvironment.…”