GEOLEX

Summary of Citation: Leatherwood

Publication:
Bromfield, C.S., 1952, Some geologic features of the Santa
   Catalina Mountains, IN Shride, A.F., ed., Guidebook for field
   trip excursions in southern Arizona: Arizona Geological
   Society Guidebook, p. 51-55

Usage in Publication:
Leatherwood quartz diorite*

Modifications:	Geologic Province:	Dominant Lithology:
First used	Basin-and-Range province	Quartz diorite

Summary:
Used as map unit on geologic map (fig. 12). (Source of map stated to be an open file map by B.N. Moore and State Geological Map.) Mapped in northeastern part of Santa Catalina Mountains, northeast of Tucson, Pima Co, AZ (Basin-and-Range province). Trends southeast from Mount Lemmon for about 12 mi. On map explanation, unit is shown to be younger than an andesite map unit and older than Rincon granite map unit. Assigned Late Cretaceous to early Tertiary age.

Summary of Citation: Leatherwood

Publication:
Peirce, F.L., 1958, Structure and petrography of part of the
   Santa Catalina Mountains: Dissertation Abstracts, v. 19, no.
   2, p. 300

Usage in Publication:
Leatherwood quartz diorite

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Basin-and-Range province

Summary:
Is an informal lithodemic unit of post-Cretaceous age. See also: Ariz. Geol. Soc. Digest [1st Ann.], p. 53-54, Oct. 1958.

Summary of Citation: Leatherwood

Publication:
DuBois, R.L., 1959, Geology of the Santa Catalina Mountains, IN
   Heindl, L.A., ed., Southern Arizona guidebook II: Arizona
   Geological Society Guidebook, p. 106-116, Also, Arizona
   Geological Society Digest, v. 2.

Usage in Publication:
Leatherwood quartz diorite

Modifications:	Geologic Province:	Dominant Lithology:
Overview	Basin-and-Range province

Summary:
Forms a stock on northeastern slope of Santa Catalina Mountains, Pima Co, AZ (Basin-and-Range province) where it intrudes Cretaceous rocks; western contact is locally concordant where it intrudes Precambrian and Paleozoic rocks at Marble Peak; elsewhere western contact is discordant. Eastern contact, where exposed, intrudes lower part of Andrada formation. Unit ranges from massive to gneissic texture and is composed of biotite, quartz, oligoclase, and epidote; minor minerals include hornblende, sphene, and apatite. Inclusions and mineral orientations are parallel which are also parallel to planar structure of nearby gneisses. Has a superposed crystalloblastic texture which formed under conditions of metamorphism.