The work presented sought to determine the effects of Mg/Ca ratios in solution have on Mg partitioning (KMg) between precipitated abiotic low-Mg calcite and solution. Experiments were set up so that would match planktonic foraminifera. This research intended investigate effect Mg/Ca(Fluid) KMg when molar value was below 0.5, which is previously reported range. values pH, salinity, aqueous monit...

In this research, the microbiostratigraphy and depositional environmental implications related to the Surgah Formation at the northern flank of the Kuh-e Sepid anticline in the Lorestan Basin are discussed. A study of small planktonic foraminifera from the 101-m-thick Surgah Formation led to the identification of three Turonian–Santonian biozones: (1) Helvetoglobotruncana helvitica, (2) Margino...

An abrupt global warming event has been recorded in many parts of the world in sediments of Latest Maastrichtian age between 65.45-65.10 Ma. This warm event was documented here at a section near Ziyarat-kola in Central Alborz based on analysis of planktonic foraminifera. An unusual abundance of normally large-size species such as Globotruncana arca, Globigerinelloides subcarinatus, Pseudoguembe...

Marine organisms must possess strategies enabling them to initiate calcite precipitation despite the unfavorable conditions for inorganic precipitation in surface seawater. These strategies are poorly understood. Here we compare two potential strategies of marine calcifyers to manipulate seawater chemistry in order to initiate calcite precipitation: Removal of Mg and H ions from seawater soluti...

Lithostratigraphy and microfacies analysis of the Avanah Formation (Middle Eocene) were studied in Gomaspan section Bina Bawi anticline, northeast Erbil city, Kurdistan Region, Iraq. The field observations refer that formation attains 56 m medium to thick bedded yellow limestone, grey dolomitic limestone blue marly interbedded with thin beds marl dark shale an interval sandy middle part red mud...