نتایج جستجو برای: سنسنجی u pb shrimp

تعداد نتایج: 207206  

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U-Th zircon SHRIMP and U-Th-total Pb monazite CHIME ages of 6 typical samples were established among different rock types outcropped into the Chah-Dozdan batholith from Iran. The zircon population displays simple internal structures in samples of the Chah-Dozdan batholith. The zircon crystals have well-preserved magmatic characteristics. In all population, the rims display younger ages than the...

2004
J. K. Hourigan P. W. Reiners

The isotopic thermochronological study included the U–Pb (SHRIMP) and fission-track dating of zircon and fission-track and (U–Th)–He dating of apatite from syenite intrusions cropping out in the eastern slope of the Sredinnyi Range of Kamchatka. The emplacement time of the intrusion was determined, and its exhumation velocity was evaluated. According to U–Pb (SHRIMP) zircon dating, the age of s...

ژورنال: علوم زمین 2015
آنتونیو کاسترو زهرا بدرزاده مهراج آقازاده

توده‌های مطالعه شده در پهنه البرز باختری و زیر پهنه طارم قرار دارند. بیشتر رخنمون‌های توده‌های مورد مطالعه ترکیب مونزونیت و کوارتزمونزونیت دارند و درون نهشته‌های آتشفشانی- رسوبی ائوسن نفوذ کرده‌اند. این توده‌ها ماهیت شوشونیتی و متاآلومین دارند. بر پایه مطالعات ژئوشیمیایی، توده‌های مورد مطالعه از یک ماگمای غیر اولیه حاصل شده‌اند که در شرایط پوسته قاره‌ای دچار تفریق و تحول شده است. در نمودارهای ع...

2008
M. Anand Chalapathi Rao A. Dongre

Department of Earth and Environmental Sciences, The Open University, Milton Keynes, MK7 6AA, U.K. 2 Department of Mineralogy, The Natural History Museum, London, SW7 5BD, U.K. 3 Department of Earth & Planetary Systems Science, Hiroshima University, 1-3-1 Kagamiyama, HigashiHiroshima 739-8526, Japan Department of Geology, Banaras Hindu University, Varanasi, 221005, India 5 Post Graduate Departme...

Journal: :The Journal of the Petrological Society of Korea 2014

2009
T. Niihara H. Kaiden K. Misawa

Introduction: The age significance of isotope chronometers in basaltic shergottites is not agreed yet [1-3]. Bouvier et al. [3] argued that crystallization ages of shergottites were old (~4.1 Ga), and suggested that young ages of shergottites (i.e., ~180 Ma) represent reset by shock metamorphism. Baddeleyite (ZrO 2) is an important mineral for U-Pb dating of basaltic shergottites. By compressio...

Journal: :The Journal of the Petrological Society of Korea 2013

Journal: :Journal of Mineralogical and Petrological Sciences 2021

The monzogranite of El Fereyid is one the rare metal–rich granites, where zircon ore minerals. Thus, studying here vital importance. Most studied grains are metamict and thus loss radiogenic Pb detected for them. Nevertheless, our study allowed us to obtain U–Pb (SHRIMP–II) age magmatic crystallization monzogranite: 626 ± 13 Ma. These data correction earlier determined (K–Ar system in biotite) ...

2016
Ye He Zhiqiang Chen Fan Mo Limei Huang LiangJun Xu Yongning Wu Zhimin Xue FengFu Fu

Various sea foods including fish, shellfish and shrimp were collected from different coastal areas of Fujian in China, and their Pb species characteristics were investigated in detail. The results indicated that there are two different species characteristics of Pb existing in sea food samples. About half of samples were detected to have only Pb(2+), and another half of samples were detected to...

2016
T. Sarkar M. Masihul Alam N. Parvin Z. Fardous Alamgir Z. Chowdhury S. Hossain M.E. Haque N. Biswas

This study is aimed to assess the heavy metals contamination and health risk in Shrimp (Macrobrachium rosenbergii and Penaeus monodon) collected from Khulna-Satkhira region in Bangladesh. The results showed that the Pb concentrations (0.52-1.16 mg/kg) in all shrimp samples of farms were higher than the recommended limit. The Cd levels (0.05-0.13 mg/kg) in all samples and Cr levels in all farms ...

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