نتایج جستجو برای: foraminifer

تعداد نتایج: 296  

Journal: :Quaternary Science Reviews 2021

Deep-time paleoclimatic records document large-scale shifts and perturbations in Earth's climate; during the Cenozoic particular transitions have been recorded on time scales of 10 thousand to 1 million years. Bifurcations leading dynamical modes could be a key element driving these events. Such bifurcation-induced critical are typically preceded by characteristic early-warning signals, for exa...

Journal: :Proceedings. Biological sciences 2007
Lee Hsiang Liow Nils Chr Stenseth

Knowing the geographic extents of species is crucial for understanding the causes of diversity distributions and modes of speciation and extinction. Species geographic ranges are often viewed as approximately constant in size in geological time, even though climate change studies have shown that historical and modern species geographic distributions are not static. Here, we use an extensive glo...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم پایه دامغان 1390

توالی های کربناته رسوبات پالئوسن پسین؟- ائوسن در زون البرز غربی (کوههای سلطانیه و تارم) در این پژوهش از حیث آثار فسیلی و فرامینیفرهای بنتیک بزرگ (large benthic foraminifer) بمنظور تفسیر محیط رسوبی دیرینه و تعیین زون های بنتیک آب های کم عمق (sbz) مورد مطالعه قرار گرفتند. در این مطالعات برای اولین بار سعی بر آن شد تا از چندین ابزار مختلف در تفسیر محیط رسوبی به طور همزمان استفاده شود. مطالعات آثار...

Journal: :Frontiers in Earth Science 2023

The radial tidal sand ridge (RTSR) off the Jiangsu Coast in south Yellow Sea is one of most fantastic and unique natural landscapes world. A large number investigations on geomorphology marine geology have been implemented during last several decades. formation evolution RTSR, however, are still under debate. To resolve this issue, 10 ∼30–60 m-long cores were retrieved from coastal plain offsho...

Journal: :Quaternary Science Reviews 2021

Planktonic foraminifer oxygen isotopes through MIS 12 were analysed from Ocean Drilling Program Site 977 in the Alboran Sea. After correction of sea surface temperature (SST) effect on δ18O composition foraminiferal calcite, resulting seawater (δ18Ow) was used to reconstruct variations δ18Ow Atlantic inflow into Mediterranean. A synchronous record KC01B core, Ionian Sea, evaluate changes isotop...

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