Geometric relationship between the Scrip Nappe and metamorphic isograds in the northern Adams River area, Monashee Mountains, British Columbia

摘要: In the northern Adams River area of Monashee Mountains, British Columbia, axial trace Scrip Nappe, a megascopic southwest-verging recumbent F1 anticline, can be traced upward through all stratigraphic units Late Proterozoic Horsethief Creek Group westward to where it is truncated by Eocene North Thompson Fault. The Nappe has been coaxially folded northeast-verging, isoclinal F2 synform with southwest-dipping surface and an amplitude about 6 km. A metamorphic culmination, defined muscovite-out isograd consisting series northwest–southeast-striking isogradic antiforms synforms, postdates Early Cretaceous folding predates normal faulting at 51–45 Ma.