) the ‘Boundary Clay’, and (3) the earliest Triassic Elikah Formation with the conodont P–Tr boundary at its base. The carbonate microfacies reveals a facies change, in the sections near Julfa, within the Paratirolites Limestone with an increasing number...

water masses. The continuation of the main negative δ13C after the end of the δ15N excursion may indicate the mixing of the water column after the anoxic period. Data of carbonate microfacies as well as stable isotopes show that the P-Tr event started...

of these formations. Based on five measured stratigraphic sections, field observations, detailed petrographic considerations on more than 500 thin sections, microfacies are analyzed and depositional environment are interpreted.

Microfacies petrographically...

‘calcite fan’ layers, of probably inorganic origin. The earliest Triassic carbonate Elikah and Shahreza formations comprise thin-bedded yellow and grey limestone beds; the microfacies succession comprises bellerophontid and gastropod wackestone...

The Kopet Dagh Basin is located in north-east Iran where sedimentation continued throughout the Jurassic–Tertiary. The area studied is in the easternmost part of the basin. Two stratigraphic sections representing mainly ...

environment, diagenesis, and geochemistry

of major and minor elements. Petrographic and microfacies pattern studies led to the recognition of five

microfacies groups including shore face, tidal flat, lagoonal, shoal and open-marine facies...

with the standard shallow benthic zonation, placing considerable emphasis on biostratigraphic and microfacies analysis implications. Four shallow benthic zones -SBZ8 and SBZ10–12- have been designated in LBF horizons comprising index zonal markers such as Alveolina...

of microfacies and sedimentary environment of Asmari Formation in the mentioned well, 150 thin sections (mainly drilling cores) have been studied and 10 microfacies, 4 facies were recognized. Based on identified facies, the Asmari formation in a carbonate...

به منظور شناسایی رخساره‌های سازند سروک در منطقه فیروزآباد، 137 نمونه با در نظر گرفتن تغییرات رخساره‌ای و خصوصیات سنگ شناختی برداشت و مورد بررسی قرار گرفت. شناسایی 13 رخساره و 3 سکانس رسوبی محدود شده توسط ناپیوستگیهای نوع ...

نهشته­ های سازند قم در ناحیه چنار، در 50 کیلومتری شمال غرب کاشان با ضخامت 147 متر شامل سنگ آهک ماسه‌­ای، سنگ آهک نازک لایه تا ضخیم لایه، توده­‌ای و شیل است که با ناپیوستگی آذرین پی بر روی سنگهای آتشفشانی ائوسن قرار دارند ...