RESEARCH· ·1970·

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LOVERING, COOPER, DREWES, AND CONE B5 TABLI~ 2.-:-Comparison of copper content of whole rock and biotite m selected samples from the Santa Rita Mountains · Rock typo Precambrian granodiorite _________________ _ Cretaceous granodiorite ___________________ _ Paleocene quartz monzonite _______________ _ Paleocene quartz latito porphyry __________ _ 1 J. L. Hurris, nnulyst. J J. L. ~'inloy, unulyst. Copper content (ppm) Whole Biotite 2 rock' 10 20 10 50 70 200 70 5,000 fr01n these samples shows a far greater increase (table 2). . . PIMA MINrNG DIS.TRICT, SIER~I.TA Petrography MOUNTAINS All biotite samples from the Pima mining district can:e f.r01n a ~u.rge composite stock of Paleocene age, wInch IS genetlcnJly related to the Esperanza and Sierritn, porphyry copper deposits (fig. 2). This ·stock and several smaller ones, which are described and shown on a preliminary ge·oiogic 1nap by Cooper (1960, pl. 1), 1 ~re mainly granodiorite. The large granodiorite body In the western part of the Pima mining district was named Ruby Sttu Granodiorite for the Ruby Star Ranch by Livingston, l\1auger, and Damon (1968) ~ 1~111ne which is here formally adopted. The type are~ IS In parts of Tps. 17 and 18 S., Rs. 12 and 13 E. The granodiorite intrudes intensely deformed rocks of Precambrian to Late Cretaceous age and is overlain unconforinably by Quaternary alluvium. The Es~eranza and Sierrita ore deposits are near the south end of the large stock, where part of the roof of the stock is exposed. The c01nposite stock consists of two granodiorite facies and, near the ore deposits, of several quartz monzonite facies not distinguished from one another on figure 2. l\1odal analyses of four specimens from which the.analyzed biotites were obtained are shown in table 3. The equigranular, border-phase granodiorite (ta;ble 3, analysis 1) is a light-gray medium-grained rock which is characterized in hand specimen by recogniz~ able quartz, twinned plagioclase, untwinned potassium feldspar, equidimensional books of biotite, hornblende, and small honey -colored crystals of sphene. This rock 1 The "atypical granodiorite" of Cooper (1960, p. 70) shown in the southwest corner of this prellmlnnry map is now known to be part of a ~'rllllssic 01· possibly .Turasslc intrusiYe. The granitic rock west of the San Xavier thrust shown near the north edge of the map, which was provisionally assigned to the Precambrian by Cooper (1960, p. 68), ls now believed to be slightly younger than the adjacent stock from whlch the biotite samples were obtained. TABLE 3.-M~da~ analyses of roc~s .in and near the Pima mining d2stnct from wh'tch bwt'ttes were obtained [Leaders (_ .) indicate not present] Granodiorite 2 3. Quartz monzonite Quartz_ _________________ 25. 1 33. 2 27.4 26. 4 Potassium feldspar and perthite_______________ 20. 6 19.2 35.4 30.1 Plagioclase______________ 45. 0 42. 8 33. 2 38. 3 Myrmekite_ _____________ Trace . 3 ---------------- Biotite and chlorite_______ 5. 9 3. 4 2. 8 3. 7 Hornblende______________ 2. 0 ~paque minerals_________ . 8 -----.-8------.-8------i.-o phene__________________ . 4 . 2 -------- . 1 Apatite and zircon________ . 2 . 1 . 2 Trace Leucoxene, epidote, and red iron oxide _________________________ _ .2 .4 TotaL______________ 100. 0 100. 0 100. 0 100. 0 1. Equigranular granodiorite, average of three specimens from eastern border zone of stock. . 2. Porphyritic grano~iorite, average of two specimens from core of pluton 2.3 mtles northwest of Esperanza mine. ?· Quartz. monzonite porphyry, "ore porphyry," average of three sp.emmens from two masses 0.5-0. 7 mile north of Esperanza mme. 4. Aplitic quartz monzonite 0.5 mile north of Esperanza mine. has gradational contacts with the porphyritic corephase granodiorite. The porphyritic core phase (table 3, analysis 2) is much hke the border phase, but lacks hornblende and contains from 2 to 10 percent phenocrysts of potassium fe~dspar wh~c~ are 1(2-3 inches long. It generally contains less biotite, more quartz, and plagioclase , of a less calcic composition than the border phase. Two potassium-argon age dates on the granodiorite facies are 60 m.y. (Creasey ·and Kistler, 1962) and 59 m.y. ( Dwmon and Mauger, 1966). The quartz monzonitic part of the stock near the ore deposits (fig. 2) includes rocks distinguishable f~om the granodiorite only by their mineral proportiOns, and als? . finer grained quartz monzo~ite porphyry a;n.d apht~c quartz monzonite phases. The quartz monzonite porphyry has sharp intrusive contacts with the granodiorite at a few places, but gradational contacts at others. The aplitic quartz monzonite phase was called biotite-bearing aplite by Anderson and Kupfer ( 1945, p. 5) and is shown as dacite porphyry on a map by Lynch (1966). It is an intrusive body approximately 1,0?0 feet wide and 1,800 feet long which is ei?p~aced In quartz monzonite porphyry and granodiOrite. It crops out half a mile north of the Esperanza mine, and also forms very small bodies closer to the mine. The quartz monzonite phases are not separately distinguished on figure 2. The quartz monzonite porphyry (table 3, analysis 3) is light gray to pinkish gray on fresh exposures. Pheno-
B6 PETROLOGY AND PETROGRAPHY. 32 • 00,r.7~~~~~7777~~~~~~~~~~1rll~·~lc.o~·~~~~~-------.------------------------------------------------1_1_11•_o_5_', EXPLANATION Paleocene Ruby Star Granodiorite grd, gran()(liorite qm, geneh:c(tlly relnted qu.nrtz '111.011- zom:te,q Henvy sUpple, porphyrit1:c rocks Contact IXtshed where approX?:m.a.tely loca.ted 1000 X30 X 15000 Sample localities Showing copper content of b1:otite in pa.rts per mill1:on Open-pit mine Ruby Star Ranch £SPERANZA MINE \::::::: \:~'::: 0 2 3 MILES FIGURE 2.--Generalized map of composite stock and associated ore deposits in the southwestern part of the Pima mining district, e·ast orf the Sierrita Mountains, showing sample localities and copper content of biotite.
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B56 GEOPHYSICS STRATIGRAPHY AND LIT
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B58 GEOPHYSICS STRATIGRAPHY AND LIT
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B60 GEOPHYSICS value. A normal free
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B62 GEOPHYSICS Hammer, Sigmund, 193
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B64 110°45' GEOPHYSICS L I I \ "'\
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B68 GEOPHYSICS A' San 0 p A c I F I
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B70 GEOPHYSICS lies occur over rela
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B72 GEOPHYSICS 36° 00' A' 40___./
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B74 GEOPHYSICS igneous massif is co
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B76 GEOPHYSICS A 50 Bouguer gravity
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B80 GEOPHYSICS FIGURE 1.-Bouguell'
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B82 GEOPHYSICS J I 37·~~------~~--
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B84 GEOPHYSICS B 600 B' 500 400 (/)
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EXPLANATION Pikes Peak • batholit
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DISTRIBUTION OF URANIUM IN URANIUM-
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B92 GEOCHRONOLOGY Fleischer, R. L.,
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B94 ECONOMIC GEOLOGY 103° 35' w 1/
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'B96 ECONOMIC ·GEOLOGY 0 500 FEET
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B98 ECONOMIC GEOLOGY TABLE !.-Summa
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B104 EJrucJh of the four samples wa
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B106 ECONOMIC GEOLOGY R. 56 E. R. 5
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B108 ECONOMIC GEOLOGY outcrop under
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BllO Brady, of the Museum of Northe
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Bll2 PALEONTOLOGY FIGURE 1.-ProtobZ
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B114 PALEONTOLOGY c .,;# I I ' ' lO
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B116 PALEONTOLOGY ments, the larges
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B120 L xMH 'xE soo~~B_R~I __ T_I __
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B122 PALEONTOLOGY Tetrataxis sp. Te
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Bl26 PALEONTOLOGY TABLE 2.-Ranges o
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B128 PALEONTOLOGY l
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BI30 PALEONTOLOGY Ocmt/rrence.-P. m
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Bl32 PALEONTOLOGY proximately 5.7 m
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Bl34 PALEONTOLOGY a b c d e f g - D
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Bl36 PALEONTOLOGY --- 1963. The ori
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B138 PALEONTOLOGY core are m1ssmg,
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B140 PALEONTOLOGY death assemblage:
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Bl42 STRATIGRAPHY EXPLANATION l:.\.
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B146 STRATIGRAPHY age. A stratigrap
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B148 5 10 15 20 X X Plntygonus Pla.
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B152 STRATIGRAPHY at a depth of 58
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B156 STRATIGRAPHY REFERENCES Brown,
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B158 STRATIGRAPHY In what follows,
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Bi60 STRATIGRAPHY TABLE !.-Stratigr
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B162 SEDIMENTATION with increasing
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llj ...... ~ TABLE 2.-Specific grav
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B166 TABLE 3.-Settling time for a 1
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Bl68 GEOMORPHOLOGY 74° 44° YERMON
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B170 GEOMORPHOLOGY have also been r
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B172 GEOMORPHOLOGY end of Long Isla
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~ooo ______________ B176 ANALYTICAL
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B178 terranes where the search for
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B180 Reproducibility Replicate anal
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B182 ANALYTICAL METHODS in the aque
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B186 ANALYTICAL METHODS 3.31 percen
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Bl88 ANALYTICAL METHODS 3" 2%" Oute
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B192 GROUND-WATER RECHARGE I T I 14
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B208. GROUND-WATER CONTAMINATION fa
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B212 SURFACE WATER plotted, and the
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B216 SURFACE WATER however, if the
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B218 SURFACE WATER TABLE 4.-Variati
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B220 RELATION· BETWEEN GROUND eral
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B222 -0.010 f -0.005 (i) RELATION B
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'B226 RELATION BETWEEN GROUND WATER
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B234 EROSION AND SEDIMENTATION side
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B240 EROSION AND SEDIMENTATION 2 3
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B244 GEOCHEMISTRY OF WATER REFERENC
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B246 HYDROLOGIC TECHNIQUES The upla
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B248 HYDROLOGIC TECHNIQUES type in
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B256 randomly fluctuating component
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B258 HYDROLOGIC TECHNIQUES 1.0 ~ Qj
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I B262 HYDROLOGIC TECHNIQUES REFERE
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,' B264 Page Gravitational sliding,
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RESEARCH· ·1970·

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