In general, the main objectives of this study are: 1-Determining relative age of these deposits using foraminifera and calcareous alga (carbonate part) as well as their stratigraphic position (evaporite and silici-clastic parts) 2-Identifying and analyzing facies and also checking vertical and horizontal changes of facies 3-Interpreting depositional
paleo environment and offering depositional
model 4-Identifying depositional
sequences and sequence boundaries by using fossils and other data and comparing sea level fluctuation at the time of deposition with global eustatic curve of Haq et al.
Unlike calcite, abundant depositional
silica is not directly visible in the presented SEM images (Fig.
environments of the Bara Formation from Lakhra areas Sindh, Pakistan.
10), and that these can be used to assess the past and current depositional
environments represented by different sampling intervals from the augered hole profiles mentioned.
A few data points showed apparent positive Ce anomaly caused by a negative La anomaly (as defined by Bau & Dulski 1996), and one data point from the Nostolepis body scale showed a real positive Ce anomaly, likely reflecting pore water anoxia present in most of the depositional
SOC and TN accumulations) was present in the depositional
Based on biogenic and abiogenic components and texture, there are 12 microfacies in the carbonate facies, those are grouped into three depositional
environments corresponding to the inner, middle and outer shelf.
The sorting of grains of the Bara formation sediments, from the Lakhra sections further indicated heterogeneity of the sediments and the depositional
But the fragmentation and rarity of Hindeodus and Neognathodus, both of which are representative of normal, nearshore, open water conditions (Merrill and von Bitter, 1976), may indicate introduction of these genera into the depositional
site by irregular storm events.
The presence of glauconite (around 2-17 (Percent) and chamosite (about 2-5 (Percent) in the lithofacies-3 may reflect the near-shore marine depositional
environment under oxidizing to mildly reducing conditions (Wenk and Bulakh, 2008; Baruah and Gogoi, 2004).
The Nyalau Formation is interpreted as a mixed wave- and tide-influenced coastal depositional
system, with an offshore wave-dominated barrier shoreface being incised by laterally migrating tidal channels and offshore migrating tidal bars.
AKM also has received final approvals for accessing drill sites for an initial first pass 2,000 metre exploration programme at the Hurimt prospect and will test the interpreted depositional
environment, which is similar to Ovoot.