gneiss protolith

Number of times cited according to CrossRef: Along-strike variations in sediment provenance within the Nanaimo basin reveal mechanisms of forearc basin sediment influx events.

The CL textures and U/Th ratios of younger than ca. 72 Ma in the youngest identified clastic portion of the accretionary western mélange belt (Sauer et al., 2017a). G3, The Cordilleran Orogen: Conterminous U. S. 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90 Ma, and underplating the Swakane Gneiss protolith to ∼40 km depth would thus had to have involved significant removal and/or transfer of lower crustal material. It is unlikely that Precambrian zircon grains were derived from transport through the crust during eruption because Precambrian crust is not present in the crustal column until much farther east of the arc [Coney et al., 1980; Patchett and Gehrels, 1998].

The presence of chaotically zoned rims in both samples is best explained by recrystallization or dissolution and reprecipitation along grain boundaries during a metamorphic event [Corfu et al., 2003; Hoskin and Schaltegger, 2003]. easily interpreted. (D) Rim/mantle and core pairs connected by a black horizontal line. Un article de Wikipédia, l'encyclopédie libre. Using this criteria, the Swakane Gneiss samples yielded MDAs between ca. This suggest that Precambrian zircons were incorporated into the Swakane protolith from sediment at the surface. Paragneiss is a variety with a sedimentary protolith. 51 and 47 Ma (Matzel, 2004; Paterson et al., 2004). Thus, the protoliths of most Skagit metasediments are older and do not overlap with the age range of the Swakane Gneiss. 90–80 Ma dates (Figs. The Swakane Gneiss protolith reached pressures of 8–12 kbars (Valley et al., 2003; Gatewood and Stowell, 2017) by ca. The U-Pb results are summarized below, in Table 1, and in kernel density estimate and histogram plots (Figs.

only quartz sandstone has enough of that mineral and no others to be a Mihai Ducea, David Pearson, and editor Laurent Godin provided helpful reviews that improved this manuscript.

Underthrusting of sediments from the retroarc side of the subduction system has been interpreted in multiple regions of the North American Cordillera (e.g., Chin et al., 2013; Pearson et al., 2017). However, the lack of clear evidence of the direction of motion during burial suggests that deposition of the Swakane protolith in a back arc setting cannot be ruled out. 10). 3). The latest motion was extensional, and is only loosely bracketed to between ca. Please check your email for instructions on resetting your password. The question remains as to whether these rapid rates of both lateral and vertical motion can be accounted for in a thrust‐loading type of model such as the one discussed above.

80–70 Ma cores. MDA—maximum depositional age; CHUR—chondritic uniform reservoir; DM—depleted mantle.

In addition, the North Cascades crust was postulated to be ∼55 km thick by ca.


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