Diamonds, dunites, and metasomatic rocks formed by melt/rock reaction in craton roots
نویسندگان
چکیده
Abstract The thick mantle lithosphere beneath cratons consists of strongly reduced rocks that have reacted with oxidized melts. These low-silica, incipient melts are rich in CO 2 and H O react surrounding forming an enriched zone at the base lithosphere, which is source region for many diamonds. Here, we reproduce these reactions novel experiments oxidised, hydrous carbonate-rich reduced, depleted peridotite 5 GPa pressure. Results explain several key features sample kimberlites as products a single process, namely formation diamonds, phlogopite alkali-amphibole bearing rocks, iron-rich dunites, garnets clinopyroxenes pyroxenitic compositions. Initially, redox freezing occurs where meet peridotite, depositing diamonds associated garnet clinopyroxenes. spreading reaction front leaves behind Fe-rich dunite, crystallizing amphibole when melt solidifies front.
منابع مشابه
Proterozoic microfossils from subsurface siliciclastic rocks of the São Francisco Craton, south-central Brazil
Compressed organic-walled microfossils attributable to five filamentous taxa, and ten coccoidal eight, (taxa originally spheroidal forms and two originally ellipsoidal, colonial forms), all having long time-ranges in the Proterozoic, have been identified in fine-grained siliciclastic sediments in cores from four bore holes cutting subsurface equivalents of the Mesoproterozoic Conselheiro Mata G...
متن کاملDirectionality of stripes formed by anisotropic reaction-diffusion models.
Turing mechanism explains the formation of striped patterns in a uniform field in which two substances interact locally and diffuse randomly. In a twin paper, to explain the directionality of stripes on fish skin in closely related species, we studied the effect of anisotropic diffusion of the two substances on the direction of stripes, in the cases in which both substances have high diffusivit...
متن کاملpragmatic transfer in compliment responses and chastisements by iranian learners of english
فرهنگ های گوناگون دریافت ها و تعبیر های مختلفی از تناسب و ادب دارند. بنابراین، ارتباط میان فرهنگی خطرات ذاتی خطای ارتباطی را نشان می دهد. این پژوهش به منظور تعیین وقوع انتقال منظورشناختی زبان در زبان بینابینی زبان آموزان ایرانی، اختلاف منظورشناختی زبان را بین فارسی و انگلیسی در کنش های کلامی پاسخ تحسین و انتقاد بررسی می کند.داده ها از میان 33 آمریکایی انگلیسی زبان، 85 زبان آموز ایرانی در سطوح م...
15 صفحه اولhydrochlorothiazide detection in urine samples by hplc-dad and experimental design dispersive l-l microextraction
hydrochlorothiazide (hct) is a diuretic agent which is shown to be effective in the treatment of hypertension. literature reports have demonstrated that urinary excretion data may be used to assess the bioavailability of various formulations containing this thiazide. also hct consumption by the athletes is one of the drugs which should be regulated by world anti-doping agency (wada), because of...
ذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Communications earth & environment
سال: 2022
ISSN: ['2662-4435']
DOI: https://doi.org/10.1038/s43247-022-00630-3