Carbonate-silicate interaction in subducting slabs recorded by Zn isotopes in western Alps metasediments
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Protolith
Statistics analysis and spatial analysis of 4 rock susceptibility data sets including amphibolite, gneiss, Zhunhua Gr., all metamorphic rock have been carried out in the paper and have gotten some conclusion as following: every unit can divided into two groups, one group with lower susceptibility may be parametamorphite and other group with higher susceptibility may be orthometamorphite. Therefore, the paper suggests the susceptibility of metamorphic rock may be add to recover the matamorphite protolith.
Protolith
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В ñòàòьå пðèвîдяòñя ðåзóëьòàòы пåòðîãåîхèìè÷åñкèх èññëåдîвàíèй пîðîд íèжíåпðîòåðîзîйñкîãî íяðòèíñкîãî ãíåйñî-ìèãìàòèòîвîãî кîìпëåкñà Пðèпîëяðíîãî Óðàëà, вåщåñòвåííый ñîñòàв кîòîðîãî îñòàвàëñя îòíîñèòåëьíî ñëàбîèзó÷åííыì.Ðàññìàòðèвàåìый кîìпëåкñ ñëîжåí пîëèìåòàìîðфè÷åñкèìè îбðàзîвàíèяìè, ÷òî ñèëьíî зàòðóдíяåò èëè дåëàåò íåвîзìîжíыì èñпîëьзîвàíèå òðàдèöèîííых пåòðîãðàфè÷åñкèх è ëèòîëîãè÷åñкèх ìåòîдîв дëя выявëåíèя èх пåðвè÷íîй пðèðîды.В эòîì ñëó÷àå îпðåдåëяющåå зíà÷åíèå дëя öåëåй óñòàíîвëåíèя пåðвè÷íîãî ñóбñòðàòà ìåòàìîðфèòîв èìååò èх хèìèзì.Íà îñíîвå èíòåðпðåòàöèè кàк ðàíåå îпóбëèкîвàííых ìàòåðèàëîв пî хèìè÷åñкîìó è ìèíåðàëîãè÷åñкîìó ñîñòàвó пîðîд, òàк è íîвых пåòðî-è ãåîхèìè÷åñкèх дàííых быëà выпîëíåíà ðåкîíñòðóкöèя èñхîдíîãî ñîñòàвà ìåòàìîðфèòîв è впåðвыå дàíà îöåíкà пàëå-îãåîãðàфè÷åñкèх óñëîвèй фîðìèðîвàíèя пðîòîëèòîв
Protolith
Metamorphic core complex
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Protolith
Isograd
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We estimated the protolith age and peak metamorphic temperature of the Yokokawagawa metamorphic rocks (YMR) east of the Itoigawa–Shizuoka Tectonic Line using detrital zircon U–Pb dating and Raman carbonaceous material geothermometry, respectively. U–Pb dating of a psammitic rock yielded a youngest age of ∼100 Ma, which corresponds to the protolith age. Raman carbonaceous material geothermometry results for five pelitic rock samples give metamorphic temperatures of ∼350–380 °C. The protolith age is consistent with those of the Sanbagawa metamorphic rocks (SMR), strongly indicating that the YMR are an extension of the SMR. The increase in peak temperature toward intrusive rocks along the eastern margin of the YMR may indicate that the relatively young ages yielded by previous K–Ar dating of the YMR reflect thermal resetting due to contact metamorphism.
Protolith
Pelite
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Micro-scale in situ REE analyses of zircon cores and rims have been carried out for eclogites from Xindian, Shuanghe, Huangzhen and jadeite quartzite from Shuanghe, Dabie Mountains. Combining with the CL internal structure and U-Pb dating, we studied the zircon REE composition change from the protolith inherited zircon to the metamorphic zircon during the ultra-high pressure metamorphism. The results show that the inherited core and metamorphic rim have quite different REE contents. It depends on how metamorphic zircon forms, overgrowth or recrystallization of protolith zircon. In general, the metamorphic zircon rims have lower REE contents compared with the protolith cores, especially in HREE. The metamorphic rims also have lower Th/U ratio than that of the cores. Detailed comparative study on REE and Th/U ratio of inherited zircon cores and metamorphic zircon rims may provide important information on forming process of metamorphic zircons and physico-chemical environment when it forms.
Protolith
Recrystallization (geology)
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