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- W2809667058 endingPage "427" @default.
- W2809667058 startingPage "414" @default.
- W2809667058 abstract "Continental rifts are tectonic zones where substantial material and heat can be transferred from the asthenospheric mantle into the crust. Because of their high thermal gradients, they were hypothesized as a setting for regional high-temperature (HT)/low-pressure (LP) metamorphism. However, the cited example is located in an intracontinental setting, where not only the compressional regime was prominent during collisional orogeny but also the envisaged continental rift failed to run into rupture. This led to ambiguous identification of the continental rift in intraplate regions and thus rejection of this hypothesis. In the present study, we identify for the first time typical HT/LP metamorphic rocks that show the occurrence of both andalusite and sillimanite in a Neoproterozoic continental rift zone. Andalusite O isotopes confirm the continental rift setting, and comparison with zircon O isotopes supports the metamorphic origin of aluminosilicates. Pseudosection calculations indicate that the HT/LP metamorphism occurred at 1.0–3.5 kbar and 560–660 °C. U-Pb dating of metamorphic titanite yields ages of ca. 750 Ma for the HT/LP metamorphism, consistent with the peak age of Rodinia breakup. Premetamorphic protoliths show bimodal lithochemistry and arc-like geochemical signatures, suggesting that they are rift magmatic rocks. These rocks would be produced during the development of continental rifting on a Grenvillian accretionary orogen that formed due to the Rodinia assembly. The continental rifting is coupled with stretching of the thinned orogenic lithosphere, accounting for the high heat flow from the asthenospheric mantle into the upper crust for the HT/LP metamorphism at shallow depths. Heat flow estimates from crustal Th, U and K contents are significantly lower than that from peak mineral assemblages, indicating that the anomalously high heat flow from the asthenospheric mantle did occur in the continental rift. Therefore, continental rifts are an important site for high thermal gradients and thus for regional HT/LP metamorphism." @default.
- W2809667058 created "2018-06-29" @default.
- W2809667058 creator A5037954073 @default.
- W2809667058 creator A5038855167 @default.
- W2809667058 creator A5089999132 @default.
- W2809667058 date "2018-09-01" @default.
- W2809667058 modified "2023-10-18" @default.
- W2809667058 title "Evidence for regional metamorphism in a continental rift during the Rodinia breakup" @default.
- W2809667058 cites W107967088 @default.
- W2809667058 cites W1587490095 @default.
- W2809667058 cites W1830358639 @default.
- W2809667058 cites W1928566219 @default.
- W2809667058 cites W1963565054 @default.
- W2809667058 cites W1963607885 @default.
- W2809667058 cites W1966642168 @default.
- W2809667058 cites W1969859799 @default.
- W2809667058 cites W1971450949 @default.
- W2809667058 cites W1972909865 @default.
- W2809667058 cites W1973328624 @default.
- W2809667058 cites W1975976713 @default.
- W2809667058 cites W1980173019 @default.
- W2809667058 cites W1985391069 @default.
- W2809667058 cites W1987606861 @default.
- W2809667058 cites W1990708256 @default.
- W2809667058 cites W1991487303 @default.
- W2809667058 cites W1992017229 @default.
- W2809667058 cites W1992357382 @default.
- W2809667058 cites W1993447760 @default.
- W2809667058 cites W1996143051 @default.
- W2809667058 cites W1996489529 @default.
- W2809667058 cites W2000326123 @default.
- W2809667058 cites W2003311821 @default.
- W2809667058 cites W2007105153 @default.
- W2809667058 cites W2008691821 @default.
- W2809667058 cites W2013579065 @default.
- W2809667058 cites W2013869511 @default.
- W2809667058 cites W2016056728 @default.
- W2809667058 cites W2017353146 @default.
- W2809667058 cites W2021701560 @default.
- W2809667058 cites W2024292236 @default.
- W2809667058 cites W2024903457 @default.
- W2809667058 cites W2026027660 @default.
- W2809667058 cites W2027381094 @default.
- W2809667058 cites W2031255348 @default.
- W2809667058 cites W2031313070 @default.
- W2809667058 cites W2035045796 @default.
- W2809667058 cites W2037313368 @default.
- W2809667058 cites W2037813080 @default.
- W2809667058 cites W2040038759 @default.
- W2809667058 cites W2041352930 @default.
- W2809667058 cites W2044358950 @default.
- W2809667058 cites W2045287269 @default.
- W2809667058 cites W2048240400 @default.
- W2809667058 cites W2048674805 @default.
- W2809667058 cites W2049120158 @default.
- W2809667058 cites W2049486454 @default.
- W2809667058 cites W2050356247 @default.
- W2809667058 cites W2053273118 @default.
- W2809667058 cites W2053422899 @default.
- W2809667058 cites W2053483240 @default.
- W2809667058 cites W2054493155 @default.
- W2809667058 cites W2056333558 @default.
- W2809667058 cites W2056465791 @default.
- W2809667058 cites W2059064471 @default.
- W2809667058 cites W2061496442 @default.
- W2809667058 cites W2063781521 @default.
- W2809667058 cites W2064248284 @default.
- W2809667058 cites W2064798552 @default.
- W2809667058 cites W2069848731 @default.
- W2809667058 cites W2073735281 @default.
- W2809667058 cites W2074170823 @default.
- W2809667058 cites W2074435754 @default.
- W2809667058 cites W2078261567 @default.
- W2809667058 cites W2081823524 @default.
- W2809667058 cites W2083364291 @default.
- W2809667058 cites W2083522304 @default.
- W2809667058 cites W2083558141 @default.
- W2809667058 cites W2083766039 @default.
- W2809667058 cites W2085849006 @default.
- W2809667058 cites W2088580377 @default.
- W2809667058 cites W2092386709 @default.
- W2809667058 cites W2093260086 @default.
- W2809667058 cites W2102828314 @default.
- W2809667058 cites W2103412746 @default.
- W2809667058 cites W2104252941 @default.
- W2809667058 cites W2106713244 @default.
- W2809667058 cites W2107402307 @default.
- W2809667058 cites W2108538927 @default.
- W2809667058 cites W2115611465 @default.
- W2809667058 cites W2123481134 @default.
- W2809667058 cites W2131360256 @default.
- W2809667058 cites W2134347319 @default.
- W2809667058 cites W2138522501 @default.
- W2809667058 cites W2140093647 @default.
- W2809667058 cites W2144222955 @default.
- W2809667058 cites W2148200895 @default.
- W2809667058 cites W2149350517 @default.
- W2809667058 cites W2151276387 @default.