تفسير توالي پاراژنتيكي نهشته هاي سيليسي آواري سازند داهو (كامبرين پيشين) در خاور و جنوب خاور زرند كرمان

Interpretation of Paragenetic Sequence of Siliciclastic Sediments of Dahu Formation (Late Camberian), in E and SE Zarand, Kerman

For interpretation of paragenetic sequence and post depositional history of siliciclastic sediments of Dahu Formation (Late Carnberian), two stratigraphy sections were measured at Dahuieh (type section) and Gazuieh in the NE and E of Zarand, with the thickness of 240 and 227 meters, respectively. The diagenetic processes affected these sediments, during three stages eogenesis, rnesogenesis and telogenesis, including compaction, cementation, alteration, dissolution, fracturing and vein tilling. Clay mineral study within sandstone and mud rocks of Dahu Formation led to identification of two groups of clay as illite and cholerite. Illite form 90% of clay minerals in these sediments that are mostly formed during burials and clay mineral diagenesis as well as alteration and dissolution of potassium feldspar. The interpreted paragenetic sequence shows that a large number of diagenetic processes act in the mesogenetic stage. Physical compaction and hematite cement have operated in eogenetic stage, while other processes such as chemieal compaction, silica and dolomite cement, feldspar alteration, sericitization, ilitization and chloritization, dissolution offeldspars and cherts have oceurred in mesogenetic stage. The fractures and calcite vein filling have formed in telogenetic stage during uplifting. We hope that this information ean be used for evaluation of post depositional and burial history of similar sediments in local and regional scale.