0000060609 00000 n Twenty plutonic lithologies have been mapped and informally named (e.g., Spotted biotite quartz diorite), including 3 compositionally-zoned plutons. 500--300 C in the Late Jurassic. %%EOF assumed basement gneisses (fish Brook) have likelyReconnaissance and locally detailed geologic mapping and U-Pb zircon geochronology have been used to establish the style, kinematics, and timing of amalgamation of metamorphic terranes in a poorly understood region in the southeastern San Gabriel Mountains.

Host rocks of the plutons and dikes are primarily metasedimentary schists and quartzofeldspathic paragneisses, along with varying amounts of interlayered amphibo- However, the terrane east of the Turtle Head Fault Zone (THFZ) has many similarities to the Boston Platform including general (Late PC.) This transcurrent zone may originally have linked west-directed thrusts in the central Transverse Ranges with those along the eastern side of the Peninsular Ranges. The lowermost unit composed of well-foliated and lineated epidote amphibolite grading upward into clinopyroxene-bearing amphibolite with a consistent NE-SW lineation. The zone, therefore, is termed the Chunky Gal Melange. The product is a tectonic mixture of fragments of amphibolites, granites, calc-silicates and ultramafic rocks in the Tallulah Falls Fm. Each unit is ca. The Cucamonga, San Antonio, and Tujunga terranes were juxtaposed along subparallel east-west trending, left-lateral ductile fault zones during emplacement of late Cretaceous granitic rocks. The Suwannee River is a federally designated wild river. 0000037301 00000 n The MHT is separated on the northwest from ensialic Laurentian basement (LB), by the Fries-Hayesville Fault System. Detailed mapping of the Chunky Gal Mafic/Ultramafic Complex of SW North Carolina indicates that the complex is involved in a set of ductile shear zones separating pods of less deformed material. the Soque River fault. Unit 3 is separated from Unit 2 by the Soque River fault. To the east, the fault bounded Rye Formation has also experienced two pre- 470 m.y. »RELATED: Climate disaster map shows Georgia as second most apocalyptic state. The O-D plutons, ultramafic rocks, and metamorphic histories suggest that the TT had docked with the MHT by Ordovician time. Gabbro links the MHT with LB rocks.

7 0 obj <> endobj and 2nd sill. The Suwannee River. Previous studies have interpreted the WLa to represent a fragment of oceanic crust, but coeval coarse-grained sedimentation and alkalic volcanism, small volume of mafic volcanics, conglomerate composition, and lack of oceanic plutonic and hypabyssal rocks suggest deposition in an arc-related rift or transtensional basin. Preliminary interpretation suggests that the LLSZ is the sheared remnant of a Triassic-Jurassic igneous terrane complete with metasedimentary pendants. These faults may be a suture equivalent to the Allatoona–Hayesville–Soque River fault system farther northeast. Intrusive borders vary from brittle to ductile and sharp to gradational, and are bounded by contact aureoles of varying metamorphic grade. 0000000016 00000 n 0 The Inconsolable body is a compositionally-zoned biotite, clinopyroxene, quartz diorite with irregular granodiorite margins. - Geol. The Cucamonga terrane consists of early Cretaceous granuliteThe Mars Hill Terrane: An enigmatic southern Appalachian terrane Fault System supports that chronology. Neoproterozoic gabbros suggest a MHT-LB link by Cambrian time, but the LB experienced neither O-D plutonism nor Paleozoic amphibolite-granulite facies metamorphism.

Metamorphic grades suggest that deeper structural levels are exposed within the LLSZ near its southern terminus. h�b``�e``f ��'�� �Y8:��x���A�A�1�a#��$�����%]xϨY��020�LY������} �M� - Geol. Compare the digital map (Figure 4) with the Hatcher (1980) version. The MHT is separated on the northwest from ensialic Laurentian basement (LB), by the Fries-Hayesville Fault System. Some inclusions are in different states of metamorphism. These rocks were intruded by late Cretaceous granitic rocks as the Cucamonga terrane was faulted against the San Antonio terrane. In the Merrimack Trough, here including the Massabesic Gneiss, the metamorphic grade ranges from the greenschist facies on the east to the 2nd sillimanite zones on the west toward the Massabesic. The Suwannee flows from the Okefenokee Swamp in southern Georgia to the Gulf of Mexico in Florida. Then there is the Soque fault line which follows the Soque River and the Salacoa Creek fault line in Cherokee County. Some plutons are compositionally-zoned [e.g., Inconsolable (100 Ma) and Lamarck (90 Ma)]; others may be the result of magma mixing. The LLSZ is a complex zone of interleaved septa of biotite schists, orthogneisses, aplitic screens, and calc-silicate gneisses approximately 500 to 800 m wide. 0000003810 00000 n


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