Using more than 1000 thin section photos of ancient (Phanerozoic) carbonates from different marine environments (pelagic to shallow-water) a new numerical methodology, based on digitized images of thin sections, is proposed here. In accordance with the Dunham classification, it allows the user to automatically identify carbonate textures unaffected by post-depositional modifications (recrystall...

[1] Measurements of the calcium isotopic composition (dCa) of planktonic foraminifera from the western equatorial Pacific and the Indian sector of the Southern Ocean show variations of about 0.6% over the past 24 Myr. The stacked dCa record of Globigerinoides trilobus and Globigerina bulloides indicates a minimum in dCasw (seawater calcium) at 15 to 16 Ma and a subsequent general increase towar...

Thrombolitic fabrics of the Rocknest Formation, Northwest Territories, Canada (Hoffman, 1975; Grotzinger and Hoffman, 1983; Grotzinger, 1986a, 1989b) were disputed by Kennard and James (1986) and Kennard (1989) and classified as cryptomicrobial boundstones. Under close re-examination, these rocks reveal mesoscopic and microscopic fabrics which are indeed thrombolitic when considered in the cont...

Studying the diagenesis of island carbonates can be hampered by difficulty accurately constraining mineral formation temperature. The carbonate clumped isotope composition (measured as ?47 value) is based on temperature-dependent binding 13C to 18O, and offers a promising means calculating In this study, we report values from ~1 km-long drill core Meiji Reef in South China Sea, which are integr...

The subject of dolomite formation has always put researchers in the challenge. In this study, origin dolomites Chorgali Formation near Pass was explored through field observation, petrographic characteristics, mineralogical and geochemical analysis. Analytical analyses used present studies include XRD, SEM-EDS, stable isotopes studies. were categorized into three major genetic types based on th...

Abstract The present study deals with diagenesis and dolomitization modeling of Middle Miocene – Quaternary sedimentary sequence outcropped at Ras Banas Peninsula, Egyptian Red Sea Coast. This is comprising successively overlapped clastics, carbonates, evaporites attaining 254 m total thickness resting on the Pre-Cambrian basement rocks in Peninsula. Diagenetic history were carefully investigat...

The Mishrif Formation is an important succession that was deposited during the Cenomanian–Early Turonian. More than 79 thin sections of core in addition to well log data for from 2 boreholes within E oilfield (E-1, and E- 2) were used determine different associations facies interpret depositional environment Formation. Six major microfacies diagnosed Formation, Mudstone, Wackestone, Packstone, ...

The current research studies the depositional setting of Jeribe Formation in south Mosul area northern Iraq, which is tectonically located Low Folded Zone characterized by deposition limestone and marly during Middle Miocene. Petrography has provided a diversity fauna such as benthonic foraminifera (Miliolid, Peneroplis sp., Dendritina sp. Borelis melo curdica) addition to Red Algae Mollusca. c...