Geology and Mineral Resources of Paraguay A Reconnaissance

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IGNEOUS AND METAMOEPHIC ROCKS 23TABLE 1. Chemical analyses of Precambrian rocks of Paraguay[Analysts: For specimens P-31 to P-75, Lois D. TrumbuU, U. S. Geological Survey; densities by L. N. Tarrant, U. S. Geological Survey; for specimens A, B, and C, MauriceGoldschlag. Spectrographic analyses for trace elements made for samples, except P-31, P-58b, A, B, and C, see table 2. Tr.=trace]SiO2 ~ --------A12O3__________________Fe2O3 _ _____________FeO _ ________________MgO____--_-__________CaO___________________NaaO__ -__ ______K2O___________________H2O-_________________H20 + _________________TiO2 _ _________________CO* -P2O5S08___-_-__s_____________________MnO ___________ _____BaO __ _________ ___ _LessDensityNormP-3174 2013. 58. 63.72. 26.793. 804. 49. 17. 47. 25.01.06.04.23.07. 1199. 88. 1299. 762. 621-4-1-3P-3474. 2613. 12. 471 Q8. 221. 533. 803. 34. 06.43.23. 16.05. 07.0599. 772. 66I-4-2-3P-58b77. 361 1. 371. 22QO. 16. 513.034. 74.05.08. 16.00.03.05. 1599. 812. 621-3-8-3P-5976. 7212. 36. 65. 63. 16. 623. 504. 71.03. 15. 14.04.03. U4.0799. 852. 611-4-1-3P-6066. 4616.082. 301. 851. 112. 744. 712. 79.09.78.47.02. 20, 13.2099. 932. 651-4-2-4NOTE. See following table for description of specimens and locality of collection numbers.P-6274. 5313.00.89. 94.461. 393.474. 47.06. 16. 27.01.07.06.0799. 852. 621-4-2-3P-7477. 8312. 29.47. 17.02. 283. 424. 96.07. 26. 10.00.01.01.0099 892. 551-3-1-3P-7577. 1712. 46. 62.48.01. 194. 144.45.03. 18.07.00.01.03.0099. 842. 56I.4-1-3A75. 8713.091. 80.35.874. 212. 83. 19. 41Tr.Tr.99. 621-3-1-3B77. 7211. 532. 182. 42. 534. 372. 57.48Tr.. 19Tr.101. 991-3-1-4C68.3517. 613.44. 651.031.223. 122.221. 12Tr.. 1798. 931-3-2-3Field No.P-31 -.__P-34.____P-58b_____P-59 _____P-60- _____P-62__ ._P-74______RockRhyolite porphyry, darkphase.Rhyolite agglomerate. _ _Rhyolite porphyry ___ ___Porphyry (fine-grained) _Aplite __ ____ _ ._Localitynear Caapucu.Highway quarry near Ypacarai.Acahay caldera.North of Caapucu on Quiindy road.Near Caapucu.Near Villa Florida-Caanucu road.Field NoP 7^B__.______C________-RockAplite__-____ ____________Apllte- ________ _Quartz porphyry __ ___Locationnortheast of Conception.Pitonoaga near Estancia Machucacufi,northern Paraguay.Northeast of Estancia La Paz, Cordillerade las Quince Puntas.FIGUEE 16. Pyritic porphyry, wall rock of the Del Puerto pyritic hematite deposit north of Caapucu. This rock (specimen P-31) contains about half percentpyrite, p; quartz, g; feldspar, /; and chloritized biotite, 6. X 15.
24 GEOLOGY AND MINERAL RESOURCES OF PARAGUAYFIGURE 17. Black porphyry (specimen P-32) from dike parallel to the Del Puerto vein near Caapucu shows andesinic phenocrysts, /, in finely crystallinematrix, a rather coarsely crystalline cognate xenolitli, c-x, not discernible in the hand specimen, and quartz (q). X 20. Crossed nicols.In the norm symbols (Washington (1917)), thefollowing significance attaches to the four parts ofthe symbol.The initial Roman numerals termed the "class" indicatesthe relation of salic to femic minerals, that is,TABLE 2. Spectrographic analyses of Precambrian rocks ofParaguay[Analyst: Paul R. Barnett, TJ. S. Geological Survey. Tr.=trace; concentrationuncertain. Looked for but not found, As, B, Bi, Cd, Ge, In, Pt, Sb, Ta, Th, Tl,U, and W]Ag_____Ba_ _Be..___Co._.__Cr_____Cu____.Ga_ _La...__Mo_.__Nb__._Ni._ -.Pb_.___Sc_-._Sn__Sr . ._V......Y.____.Yb____.Zn_____Zr ...P-310. 0001.1.0006.0002.0003.003.002.006.0002.0010 .009.00050.02.002.005.0004.2.02P-34 P-58b P-59 P-600 0 0 0 .05 .1 .07 .2.0007 .0004 .0003 0. 0002i Tr. Tr. .0008. 0004 . 0002 .0001 .0003.0007 .0003 .0002 .0007.002 .002 .001 .001.006 .006 .006 0.0002 .0001 .0003 .0003.001 .001 .001 .0020 . 0004 0 0 .002 .004 .003 .004.001 .0003 .0003 .0010 0 0 0.02 .009 .009 .05.0009 .002 .0004 .004.007 .006 .005 .007.0007 .0004 .0004 .00030 0 0 .03 .01 .040 .01P-62P-75 P-lOla P-lOlb0 0. 00004 0 .004 .02 .1.0007 .0006 .00050 .0005 .0005Tr. .002 .001.0002 .002 .001.003 .004 .00100 00 .002 .0002.003 .01 00 .001 .0008.005 .002 .0030 0 .00040 .0006 0 .0006 .002 .01Tr. .007 .005.007 .02 .004.0008 .002 .00040 0 0 0.01 .03 .08 .01P-740 0 .07 .0020 .0004.0003 0.0001 .0001.0003 .0002.001 .002.005 0.0002 .0003.001 .0020 0 .003 .003.0004 00 0.03 .002.002 Tr..004 .004.0002 .00040 .02NOTE. See following table for description of specimen and locality of collectionnumbers.Field No.P-31 .....P-34___P-58b..._-P-59 __ _P-60__P-62_____.P-74 _____P-75- -P-lOlb. _.RockPorphyry, dark phase ...Rhyolite agglomerate. _ _Rhyolite porphyry ......Porphyry (fine grained) _LocalityCountry rock of Del Puerto vein outcropnear Caapucu.Highway quarry near Ypacarai.Acahay caldera.North of Caapucu on Quiindy road.Near Caapucu.quartz-|-f el dspars+feldspathoids versus ferromagnesiansilicates-)-oxides + carbonates-]-phosphates, and others.There are five classes.The second numeral indicates the order, based ondifferences in the chief subgroup of the preponderantsalic or femic group, and serves to distinguish thosechemical characters that are dependent on the dominantacid-forming components of the magma, silicon, titanium,and ferric iron. For rocks not definitely femicin character, there are nine orders.The third numeral indicates the rang, based on theproportions of alkalies to lime in the preponderant salicage.age.
Page 1 and 2: Geology and MineralResources of Par
Page 3 and 4: UNITED STATES DEPARTMENT OF THE INT
Page 5 and 6: IVCONTENTSMineral resources._______
Page 8 and 9: GEOLOGY AND MINERAL RESOURCES OF PA
Page 10 and 11: INTRODUCTION(1947, 1952) are the on
Page 12 and 13: GEOGRAPHYFIGURE 1. Index map showin
Page 14 and 15: GEOGRAPHYbisects the Republic of Pa
Page 16 and 17: GEOGRAPHY 9thorny semidesert plants
Page 18 and 19: GEOLOGY 11chiefly logs, rough lumbe
Page 20 and 21: IGNEOUS AND METAMORPHIC ROCKS 13and
Page 22 and 23: 15FIGURE 7. Arkosic sandstone (spec
Page 24 and 25: IGNEOUS AND METAMORPHIC ROCKS 17FIG
Page 26 and 27: IGNEOUS AND METAMOKPHIC ROCKS 19acc
Page 32 and 33: 25FIGURE 18. Ehyolite (specimen P-3
Page 36 and 37: IGNEOUS AND METAMORPHIC ROCKS 29PET
Page 38 and 39: IGNEOUS AND METAMORPHIC ROCKS 31DIA
Page 40 and 41: IGNEOUS AND METAMOEPHIC ROCKS 33a d
Page 42 and 43: GEOLOGICAL SURVEY PROFESSIONAL PAPE
Page 44 and 45: 36 GEOLOGY AND MINERAL RESOURCES OF
Page 50 and 51: 42dated by two kinds of porphyry. O
Page 52 and 53: 44FJGTJEE 34. Porphyry (specimen P-
Page 68 and 69: 60lower third of the series consist
Page 74 and 75: 66possible Cretaceous age. Baker (1
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72 GEOLOGY AND MINERAL RESOURCES OF
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174 GEOLOGY AND MINERAL RESOURCES O
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MINERAL RESOURCES 87a pivot, show s
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MINERAL RESOURCES 89of the bright r
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Geology and Mineral Resources of Paraguay A Reconnaissance

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