0000037946 00000 n Am., Abstr. 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. the Soque River fault. 500--300 C in the Late Jurassic. In the vicinity of Chunky Gal Mountain the melange coincides with the premetamorphic Hayesville Thrust of R. Hatcher. Some inclusions are in different states of metamorphism.

0000002560 00000 n

The product is a tectonic mixture of fragments of amphibolites, granites, calc-silicates and ultramafic rocks in the Tallulah Falls Fm.


To the west the Nashoba Terrane has been deformed and polymetamorphosed to the sill.

Previous studies have also described the terrane as melange, but recognition of local pseudostratigraphy allows mapping of multiply folded, isoclinal, nappe-like structures. Although syntectonic porphyroblasts suggest that the movement began during the metamorphism, the melange postdates the peak of the main regional metamorphism and separates superposed granulite facies rocks from those of amphibolite facies.

This rock assemblage contrasts with that of the adjoining terranes. The base of the Spotted intrusion appears to have been magmatically eroded by a pulse of the younger Lamarck intrusion. Gabbro links the MHT with LB rocks. endstream endobj 8 0 obj <>/ViewerPreferences<>>> endobj 9 0 obj < The Hayesville Thrust itself reflects an early stage of suturing of this terrane with North America. 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. Displacement for each of the mylonitic fault zones was approximately several tens of kilometer and was part of a broad left-lateral shear system that was active between 90 and 81 Ma ago. 7 0 obj <> endobj Also, the area between the Norumbega FZ and the THFZ has experienced high grade metamorphism of probable Silurian age and thus may be similar to the Nashoba Terrane. ), indicating one or both may be PC. A tectonic model suggested here is that the eastern Blue Ridge represents a poorly to fully developed accretionary prism that was built above an east dipping subduction zone during the closure of a marginal sea. The Suwannee River. The MHT is characterized by migmatitic biotite-pyroxene-hornblende gneiss, but contains 1--1.8 b.y.

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. Programs; (United States) experienced Late PC metamorphism. The WLa consists of meta-supracrustal rocks with well-preserved relict textures, and massive, meta-ultramafic rock. The O-D plutons, ultramafic rocks, and metamorphic histories suggest that the TT had docked with the MHT by Ordovician time. xref The only correlative units between the MHT and adjoining terranes are Neoproterozoic gabbro, Ordovician-Devonian granitoid plutons, and ultramafic rocks. You don’t remember a … 0000000794 00000 n trailer 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. A weaker lower amphibolite metamorphism postdates the melange. Small-scale nappes are generally 100+ m thick and are imbricated with massive meta-ultramafic rocks along gently to steeply east-dipping shear zones. - Geol. No lithologic, isotopic, or structural data support suggestions that any of these rocks were accreted to North America during the Tertiary. Linear fabric elements plunge east.

- Geol. 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. On the east, the MHT is bounded by the allochthonous, ensimatic Toe Terrane (TT) across the diachronous, ductile Holland Mountain-Soque River Fault System. and 2nd sill. Supracrustal rocks include polymict conglomerate and breccia, fine-Southeastern New England is subdivided into three major fault bounded tectonic terranes, each with a distinctive metamorphic history. A new tectonic map of the southern and central Appalachians incorporates modern field and structural-stratigraphic, geochronologic (mostly sensitive high-resolution ion microprobe–reverse geometry, SHRIMP–RG, and Sm-Nd), geochemical, and geophysical data to identify crustal boundaries and blocks. 0000000946 00000 n 0000000616 00000 n 0000037301 00000 n the Soque River fault. 0000037921 00000 n

The metasediments show a transposed pervasive late foliation (S/sub 2/.)

In theDetailed mapping of the Inconsolable Range in the east-central Sierra Nevada reveals a structurally and lithologically complex region of multi-phase intrusions. During Taconic or Acadian events, both the TT and MHT reached amphibolite to granulite metamorphic grade, but the LB did not exceed greenschist grade. Soc.
although the sense of intersection of earlier fabrics is locally determinable. While the geom- Evidence for pre-Alleghanian metamorphism includes a Proterozoic Z(.) Each unit is ca. Unit 3 is separated from Unit 2 by the Soque River fault.


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