stripes
This is the most easterly of four sodic intrusive complexes (Nos 2-5) aligned east-west and extending over 70 km (Daugherty, 1966). They lie only a short distance south of La Cueva (No. 1) and east of the Terlingua-Big Bend area of Texas (U.S. No. 105). Each intrusion apparently has a core surrounded by one or more rings, and three of the intrusions display magmatic doming, cauldron subsidence and ring dyke formation. Aegirine, nepheline and analcime-bearing syenites are prominent in four of the intrusions. Levinson (1962, p. 68) describes the central plug at Aguachile as consisting of a quartz microsyenite containing riebeckite and McAnulty et al. (1963) refer to the presence of dykes and irregular intrusions of teschenite.
DAUGHERTY, F.W. 1966. Aligned intrusive complexes in northern Coahuila, Mexico. (abstract). Special Paper, Geological Society of America, 87: 41-2.
Daugherty, F.W., personal communication, 1984.
LEVINSON, A.A. 1962. Beryllium-fluorine mineralization at Aguachile Mountain, Coahuila, Mexico. American Mineralogist, 47: 67-74.
MCANULTY, W.N., SEWELL, C.R., ATKINSON, D.R. and RASBERRY, J.M. 1963. Aguachile beryllium-bearing fluorspar district, Coahuila, Mexico. Bulletin of the Geological Society of America, 74: 735-44