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- W2224791738 abstract "The Franciscan Complex comprises the largely sedimentary basement of the California Coast Ranges. This classic trench deposit has undergone a series of superimposed tectonic events since the end of Jurassic time, involving accretion, high-pressure (HP) recrystallization, buoyancy and wedge-driven exhumation, and transcurrent slip. Processes reflect plate convergence, transpressive-orthogonal subduction, and transpressive–transtensive offset. Besides stratigraphically intact strata, the Franciscan displays widespread mélanges of four main types: diapiric serpentinite intrusions, sedimentary olistostromes, broken formations, and tectonic block-in-matrix units. In the northern Coast Ranges, mélanges are especially prevalent in the Central Belt, but also occur in the Eastern and Coastal belts. Diapirs show upward, buoyant flow relative to wall rocks, but some also appear to have involved wedge-driven thrusting. Many serpentinite diapirs and tectonic mélanges contain exotic metamafic inclusions rimmed by actinolite–chlorite reaction rinds. Olistostromes include gravity slump blocks and conglomeratic lenses; petrologically similar to larger slide blocks, pebble layers document a surficial, sedimentary origin, as does the presence of volcanic arc clasts. Broken formations grade by degrees from intact stratal continuity to disrupted units; they only contain cognate boudins of rocks present in the ductile matrix. Some tectonic mélanges are simply intensely disaggregated broken formations, and include rock types of the stratigraphic host. Other tectonic mélanges carry exotic HP blocks of diverse lithologies, generally reflecting higher pressures than attended recrystallization of the low-density matrix. The four mélange types formed through diverse convergent plate-tectonic processes. Many were subjected to a multi-stage overprint; most are strongly deformed, obscuring original textures and structures. Broken formations are the most common disrupted units, accompanied by lesser amounts of tectonic mélanges, olistostromes, and ductile-matrix diapirs. In aggregate, these units reflect the operation of contrasting processes that attest to plate-tectonic evolution of the Franciscan Complex. Strong deformation accompanied oceanic plate underflow, but also took place during coeval HP metamorphism and surfaceward return of accretionary packets, then transitioned to long-sustained, chiefly dextral slip." @default.
- W2224791738 created "2016-06-24" @default.
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- W2224791738 date "2015-11-16" @default.
- W2224791738 modified "2023-09-27" @default.
- W2224791738 title "Franciscan mélanges: coherent blocks in a low-density, ductile matrix" @default.
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- W2224791738 doi "https://doi.org/10.1080/00206814.2015.1108879" @default.
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