A TYPE OF IGNEOUS DIFFERENTIATION 
Quartz nce se seeoe 
Orthoclase 
Albite 
Corundum 
Diopside 
Hypersthene 
Qlivineheee ice ees 
Miagnetitessenniicodesn ce 
Ilmenite 
TABLE I—Continued 
Norms AND CLASSIFICATION 
tg. Olivine diabase. 
20. Olivine gabbro. 
21. ‘‘Altered Gabbro. 
19 20 2 22 23 24 
SOD CREGIS RETO Ur | SE EDIE NBIC een BE) Mester sep ecctevell icin cheiete uanseas 6.60 
5.00 3-9 5.6 2.22 QUST EENS| hence eras 
27.77 22.0 33.0 15.20 28.8 8.38 
34.47 37.0 22.5 73.40 58.7 78.68 
ES UCLA toe reer Raa Soran ee 3-41 4.5 Lite eestpare ee 
Bnei 50 | AE yee eer I slat oe ios il aay CR | Me 1.53 
8.090 8.9 19.3 DENG /aianll ete os patrons ape cake ener 
2.76 DTSOMA GE tesa, Weer le eee Gl reiiake: | SeaNere susan 1.46 
SAC / Sal Mince nao al lemriRen, - 0 Het 2.70 OHH | amie er ater 
1.30 3.0 5S Ci ey [eRe re eee 0.5 1.39 
2.13 CSIC} ante || aie a seesee al tea tau aero tl ee Laat Se 
WRAL A RO yl bene eee Se 4.2 aes) Ar PN tee can as) banate ead | aa Op 
EN SA AR Ge 2.0 bei atten) (SHO ao ad lo pope tcca: 
Dosalic Dosalic Dosalic Persalic Persalic Persalic 
Perfelic Perfelic Perfelic Perfelic Perfelic Perfelic 
Docalcic Docalcic Alkalicalcic Docalcic Docalcic Percalcic 
Dosodic Dosodic Dosodic Persodic Persodic Persodic 
Hessose Hessose Andose Labrado- Labrado- Persodic 
rose rose Canadase 
I1.5.4.4 T1.5.4.4 ES Bo@akt lave Gotha Mo GoSoS 
Pigeon Point. A.N. Winchell. Am. Geol., XXVI, 213. 
Pigeon Point. W.F. Hillebrand. U.S. Geol. Survey Bul. 100, p. 63. 
East of Baptism River.’”’ Dodge and Sidener. This probably is ‘‘ Beaver 
Bay diabase.” 
22. Anorthosite. 
Mon., V, p. 438. 
23. Anorthosite. 
24. Anorthosite. 
Minn. Geol. and Nat. Hist. Survey Bul. 2, p. 79. 
At mouth of Split Rock River, quoted from R. D. Irving. U.S. Geol. Survey 
Carlton Peak. A. N. Winchell. 
At the foot of Caribou Peak. C. F. Sidener. 
Am. Geol., XXVI, 281. 
TABLE I—Continued 
NorMS AND CLASSIFICATION 
25 26 27 28 
QUaTEZ sere Soe et anceetee ieee anode 25.50 33.00 33.00 38.28 
Orthoclase haere esa eee 23.01 17.79 6.67 17.24 
PANIES rea ers eemt aiaig cts teeta nt cies 28.82 22.53 50.83 18.86 
PANIOLENICE ey ee hoo eee ee 5.28 TOMS OMA wile ee us meals 4.73 
Corund ime eee eee aie a ay aera 0.61 De gira! hil ea alenclesey ame ty T1538 
EAE COM EAS cee he ater Lapa ate MERE lebih OSA Min uit ue vsns caasilanccHoter oa salieeouree dave daceacetrenometica| cite cyan toetiey after atts 
TD) TOPSIG EBs yeaah Tete eau ate Wen llouuye | erat amet tall age Apa AP ILC SPN Ys eis | RUA RA Ae Ee 
Ey persthenes annie meric eens 6.87 3.00 0.10 1.80 
JN VaWh USNS ape ARC IPT ER PICT SS ETSI G/CR CaP GN El [URE GIP REE 9 Ce TRESS RI Sn BVO Stewie Gan ivy s Anus as 
Miaenetiter: fee oe sion wate ene 6.26 OMSL Aes Getter ne i 0.93 
Mimenite nee ce cieia wel soraeneniaa oes STS 37ers Ait = pall en ase ena APP Wl al ae NRC cat 
PL EMAGIEC a pinscher eh EUS ete ae ee ene ake eS r.28 0.096 13.76 
JPNTORM Be shar sae eat Pe ee RN bie ee ear sa ed OPES Ab rece Peete te orien eves (Ie mann erence Ica Get Suen as ule are 
Dosalic Dosalic Persalic Dosalic 
Dofelic Quarfelic Dofelic Quarfelic 
Domalkalic Domalkalic Peralkalic Domalkalic 
Sodipotassic Sodipotassic Persodic Sodipotassic 
Adamellose x Noyangose x 
IL.4.2.3 JUS ObGS} AS TNS Te 2)93 
25. Red Rock. N.W. corner Sec. 27, T. 50 N., R. 14 W. F. F. Grout. 
20. Red Granite. 
Ann. Rep., p. 100. 
27. Red Granite. 
Ann. Rep., p. 204. 
28. Red Granite. 
Ioo. 
Rice’s Point, Duluth. J. A. Dodge. 
Rice’s Point, Duluth. J. A. Dodge. 
East of Lester River, East Duluth. J. A. Dodge. 
Survey, 13th Ann. Rep., p. 
Minn. Geol. and Nat. Hist. Survey, 13th 
Minn. Geol. and Nat. Hist. Survey, roth 
Minn. Geol. and Nat. Hist. 
