34 



STRUCTURAL GEOLOGY OF NORTH AMERICA 





CENTRAL TEXAS 



NORTH TEXAS 



TEXAS PANHANDLE 



WICHITA MOUNTAINS- 

 BURIED AMARILLO 

 MOUNTAINS 



ARBUCKI.E MOUNTAINS 



VAN HORN AREA 



WEST MARGIN OF TEXAS 



CRATON ; FRANKLIN 



MOUNTAINS; SOUTHEAST 



NEW MEXICO 



LATE 

 PRECAMBRIAN 













sedimentary rocks 

 (Van Horn sandstone) 





SWISHER GABBROIC 



TERRANE 

 emplacement of gabbro 

 (lopolith?) ; contact 

 metamorphism of sedi- 

 mentary rocks 



WICHITA IGNEOUS 

 PROVINCE 



gabbro-granite (670m.y.) 

 intrusion; contact meta- 

 morphism of sedimentary 

 rocks (Meers quartzite) 





local orogeny — cata- 

 clastic metamorphism; 

 diorite intrusion 



subsidence; sedimentary 

 rocks (carbonate rocks 

 and siltstones) 



sedimentary rocks 

 Meers quartzite) 



sedimentary rocks 

 (Allamoore and Hazel 

 formations) 



PANHANDLE 

 VOLCANIC TERRANE 

 lavas, tuffs, shallow 

 intrusives — mostly 

 rhyolite 





rhyolite intrusions? 

 (East and West Timbered 

 Hills porphyries) 



rhyolite intrusions 



rhyolite intrusions and 

 extrusions 



FISHER 

 METASEDIMENTARY 



TERRANE 

 regional metamorphism 

 of sedimentary rocks 



RED RIVER 

 MOBILE BELT 

 regional metamorphism 

 of sedimentary rocks; 

 intrusion 





synorogenic? granite 

 intrusions 



VAN HORN 

 MOBILE BELT 

 regional metamorphism 

 (Carrizo Mountain 

 group pre-rhyolite) 



regional metamorphism 

 of sedimentary rocks 

 (Lanoria quartzite?) 



















MIDDLE 

 PRECAMBRIAN 



TEXAS CRATON 

 granitic intrusions 

 (about 1000 m.y.) 



Texas era ton to south 



TEXAS CRATON 

 granitic intrusions 







Texas craton to north 

 and northeast 



Texas craton to east 



regional metamorphism 

 and intrusion (Valley 

 Spring gneiss, Pack- 

 saddle schist, older 

 gneissic meta-igneous 

 rocks. 











Fig. 4.8. Tentative correlation of Precambrian rocks and structural events in Texas, southern Oklahoma, 

 and southeast New Mexico. Reproduced from Flawn, 1956. 



Hamilton (1956c) thinks might correlate with the Duluth gabbro. 



The lithologies and age relations recognized by Flawn (1956) of the 

 Texas Precambrian rocks leave considerable to be desired for a conclusive 

 tie with the Keweenawan belt. The volcanics are mostly rhyolite and 

 not basic varieties as in the Keweenawan series, and orogeny including 

 acidic intrusions and some metamorphism appears to be indicated. This 

 is not characteristic of the Keweenawan belt. 



J. Tuzo Wilson (1956) has suggested that the sediments of the Ke- 

 weenawan, Huronian, and Mistassini groups along the Grenville front 



in Ontario and Quebec have been derived from the Grenville orogenic 

 belt, and that a secondary mountain belt has resulted by their deforma- 

 tion at a later time. The Huronian rocks in Minnesota, Wisconsin, and 

 Michigan have a much wider distribution than the Keweenawan series 

 with its flanking faults, and are not so clearly a narrow belt as the 

 Keweenawan. The writer sees in the Keweenawan belt one somewhat 

 like the Triassic basins of the Piedmont crystalline province of the greater 

 Appalachian mountain systems. See Chapter 9. These are long narrow 

 fault-formed basins filled with thick sections of continental clastic sedi- 



