High-Mg# Adakitic Rocks Formed by Lower-crustal Magma Differentiation: Mineralogical and Geochemical Evidence from Garnet-bearing Diorite Porphyries in Central Tibet
نویسندگان
چکیده
منابع مشابه
ژئوشیمی رادیو ایزوتوپ‌های Rb–Sr و Sm–Nd و پتروژنز توده‌های نفوذی مرتبط با کانی‌سازی مس پورفیری غنی از طلای منطقه اکتشافی ماهرآباد (شمال هنیچ)، شرق ایران
The Maherabad gold-rich porphyry copper prospect area is located in the eastern part of Lut block, east of Iran. This is the first porphyry Cu-Au prospecting area which is discovered in eastern Iran. Fifteen mineralization-related intrusive rocks range (Middle Eocene 39 Ma) in composition from diorite to monzonite have been distinguished. Monzonitic porphyries had major role in Cu-Au mineraliza...
متن کاملسنگشناسی و ژئوشیمی گدازه‌های‌بالشی و سنگ‌های‌مافیک ، حدواسط و فلسیک وابسته به آن در دنباله‌ی افیولیتی صحنه- هرسین (شمال‌شرق کرمانشاه)
The ophiolitic complex of Sahneh-Harsin is composed of rock units such as gabbro, basalt, diabasic dikes, diorite and plagiogranite. The geochemical studies show that primitive magma has been sub-alkaline tholeiitic Mg-rich and K-poor. These data show enrichment of light rare earth elements (LREE) and depletion of heavy rare earth (HREE). The ratio of NbTa in the basalts is between 16.19 and 18...
متن کاملنقش زینوکریست‌ها، برونبومها و دایک‌های همزمان با پلوتونیسم در تفسیر تحول ماگمایی مجموعه پلوتونیک الوند: با تاکید بر شواهد زمین‌شناسی و کانی‌شناسی مربوط به آمیختگی ماگمایی
: Despite that, in the Alvand complex, the mafic-intermediate rocks (gabbros, diorites and tonalites) are mostly older than felsic rocks (granodiorites and monzogranites), and mineralogical and geochemical discontinuity is seen between them, there are evidence that indicate they have sometimes been co-existed. With the studies on field relationship of rocks, xenocrysts assemblages, synplutonic ...
متن کاملAdakites without slab melting: High pressure differentiation of island arc magma, Mindanao, the Philippines
New geochemical data for Pleistocene magmatic rocks from the Surigao peninsula, eastern Mindanao, the Philippines, demonstrate typical adakitic traits, including elevation of Sr /Y and depletion of the heavy rare earth elements. Sr / Sr and Nd / Nd ratios of the adakites do not support melting of the subducted Philippine Sea Plate but resemble Pliocene arc lavas generated in the same subduction...
متن کاملMagma hybridization in the middle crust: Possible consequences for deep-crustal magma mixing
The 465 Ma Svarthopen pluton in northcentral Norway was emplaced under middle-crustal conditions (~700 MPa) into metasedimentary rocks of the Helgeland Nappe Complex. The pluton is characterized by zones of mingling and mixing of gabbro/ diorite with peraluminous, garnet-bearing biotite granite. Variation in bulk-rock Sr and Nd isotope ratios are consistent with simple mixing; however, nonunifo...
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ژورنال
عنوان ژورنال: Journal of Petrology
سال: 2020
ISSN: 0022-3530,1460-2415
DOI: 10.1093/petrology/egaa099