دانلود نقشه زمین شناسی شیراز

دانلود نقشه زمین شناسی شیراز

نقشه زمین شناسی شیراز

بنابه درخواست یکی از کاربران محترم

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نشریه شماره 76علوم زمین

نشريه شماره 76 علوم زمين

وزارت صنايع و معادن
سازمان زمين شناسي و اكتشافات معدني كشور
فصلنامه علمي – پژوهشي
تابستان 89 سال نوزدهم ، شماره 76
شابك:7429-1023

 

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تفسیر رخساره ای نهشته های کرتاسه پایینی پلاتفرم عربی...

FACIES ANALYSIS OF THE EARLY CRETACEOUS ARABIAN PLATFORM

 KURDISTAN REGION, NE- IRAQ

The lithofacies of the Arabian platform are studied in four outcrop sections during Early Cretaceous in the northeastern Iraq, Kurdistan Region directly to the southwest of Zagros Main Thrust Zone. In this area the platform is mainly represented by Qamchuqa Formation (about 600m thick) which consist of dolostone and both reefal and lagoonal limestone successions. The prevailing lagoonal facies are miliolid–bioclast mudstones, pelloidal wackstones to packstone. The reefal facies are: Ooid packstones to grainstones, stromatolites (sheetstone) and rudists bearing lithofacies (coral pillarstone), oncoids lithofacies (ballstone), branching coral bearing lithofacies (coral bafflestone). The forereef facies are coral-bearing sandy and marly Limestone (coral floatstone), orbitolina lime wackestone and Rudstone microfacies. The most common facies are dolostone, lime mudstone and wackstone. Therefore, the environment was relatively calm and warm with more or less restriction in circulation except in limited time and space as represented by high energy facies. The environment was consisted of barrier reef with associated fore and back reef (lagoon) environment. These facies also important tectonically as delineate the most northeastern extend (or boundary) of the Arabian Platform during Early Cretaceous

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