Abstract
This study determines the geochemical and depositional environment analysis of the sediments of the Sohnari Member of the Laki Formation, Northern Kirthar Fold Belt of Pakistan. The Energy-Dispersive-X-Ray Spectroscopy (EDS) technique is used for the detection of major elements and the effects of shifting depositional climatic conditions of six representative samples which were acquired from the Sohnari Member of the Laki Formation at Lakhra area, Sindh, Pakistan. The sedimentological studies clarify that the sediments the Sonahri Member are relatively immature and most migrated in clastic mode. The availability of Silica shows that the Member was formed due to biochemical precipitation and detrital mode and was deposited at a fast rate of sediment deposition under the fluvio-deltaic depositional system. This is also deduced that the rapid rate of sediment deposition might be created a reducing atmosphere and allowing for the mineralization of sulphur.
Highlights
The Energy-Dispersive-X-Ray Spectroscopy (EDS) technique is used for the detection of major elements and the effects of shifting depositional climatic conditions of six representative samples which were acquired from the Sohnari Member of the Laki Formation at Lakhra area, Sindh, Pakistan
Due to different characters the Sonhari member (Figure 3). It is worth including the position from the Laki formation SM is a section of clastic sedimentary rock transported beginning the east placed among the Chat member and the Lakhra Formation
The detailed geological fieldwork was carried out and rock samples were collected for the study, one section of Sohnari member was measured from the eastern flank of the Lakhra anticline
Summary
Sohnari member is the basal part of the Laki Formation which overlies the Ra-. Its basal contact is with Ranikot Group and got is unconformable obvious and its upper contact is with chat member of Laki Formation [3] [4] [5] [6]. Our study is focused on a geochemical investigation of the Sohnari member of the Laki Formation to interpret its origin and climate (Figure 1). SM of the Laki Formation is thought to be a distinct origin from the Lakhra Formation and the overlying Chat member. Due to different characters the Sonhari member (Figure 3) It is worth including the position from the Laki formation SM is a section of clastic sedimentary rock transported beginning the east placed among the Chat member and the Lakhra Formation. The SM is known as basal Laki laterite and represents the very slight regression possibly a reduction in the rate of the sinking of the continental shelf in the Indian Shield of Indian Plate and the peat is accumulated very close to the sea level
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