T7' IN REPLY REFER TO: UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY WASHINGTON 25, D. C. AEC - 430/5 February 14, 1955 Mr, Robert D 0 Niiiinger, Acting Assistant Director Division of Raw Materials U, S* Atomic Energy Commission Washington 25, D. C. Dear Bobs Transmitted herewith are three copies of TEI-478, "Pegmatites and associated rocks in the Newry Hill area, Oxford County, Maine, 11 by the late Vincent £, Shainin and Louis F. Dellwig, November 1954- We are asking Mr. Hosted to approve our plan to submit this report for publication as a bulletin of the Maine Geological Survey. In the published version, tonnage estimates will be deleted from the section entitled "Mineral deposits." Sincerely yours, f ^"^—-H - o-u^ -H>-TW.P H. Bradley Chief Geologist JAN 2 2 200! This document consists of 71 pages, plus 1 figures, Series A UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Vinaettt E. Snainin and Louis F. Dell wig November 1954 Trace Elements Investigations Report 478 This preliminary report is distributed without editorial and technical review for conformity with official standards and nomenclature,, It is not for public inspection or quotation. *This report concerns work done partly on behalf of the Division of Raw Materials of the U. S, Atomic Energy Commission and in cooperation with the Maine Geological Survey. USGS - TEI-478 GEOLOGY AND MINERALOGY Distribution (Series A) No,... of copies Argonne National Laboratory ............. *...„. .....to... ...,,. «, 1 Atomic Energy Commission, Washington ......... ...............a.... 2 Division of Raw Materials,, Albuquerque ............................. 1 Division of Raw Materials, Bufte ......•••....eo....o.»«...o..«.« « 1 Division of Raw Materials, Casper ............................... 1 Division of Raw Materials, Denver ,...<,........................... 1 Division of Raw Materials, Hot Springs. ......... ......... ........... 1 Division of Raw Materials, Ishpeming .............................. 1 Division of Raw Materials, Phoenix ............................... 1 Division of Raw Materials, Richfield ...... ......................... 1 Division of Raw Materials, Salt Lake City ............................ 1 Division of Raw Materials,, Washington. ............................. 3 Exploration Division,, Grand Junction Operations Office ..................... 1 Grand Junction Operations Office. ................................ 1 Technical Information Service,, Oak Ridge............................ 6 Tennessee Valley Authority, Wilson Dam ............................ 1 U0 S, Geological Survey: Fuels Branchs Washington ...o...... .............••••••«•••••• 1 Geochemistry and Petrology Branch,, Washington......................... 1 Geophysics Branch, Washington ................................. 1 Mineral Deposits Branch, Washington .............................. 2 E. He Bailey0 Menlo Park .................................... 1 A e Le Brokaw, Grand Junction .................................. 1 C, Ee Dufton, Madison. 0 . 00 ................... 0 »th......«»o» 1 M» R0 Klepper, Spokane ..................................... 1 A 0 H0 Koschmann, Denver. ................... .......... «,«,..«,. 1 R0 A. Laurence, Knoxville. ...... ... O .o........ 0 ec...»».» ..«,.. 1 Ls Re Page, Washington ..................................... 1 P. Ce Patton, Denver ...................................... 2 J. F. Powers, Salt Lake City ................................... 1 Qe De Singewald, Beltsville ................................... 2 A 0 E. Weissenborn, Spokane ................................... 1 TEPCO, Denver ....... .................................. 2 TEPCO, RPS 8 Washington, (Including master) .......................... 2 46 3 CONTENTS Page Abstract ........................................p....... 6 Introduction ... 0 ,... € ..................................... 7 Field work and acknowledgments ................................... ? Previous work ............................................. *° Geology „ 0 ......... ..................................... H Metamorphic rocks ., 0 ... p ................................ H Quartz-muscovite schist , 0 .... ........................... H Quartz-biotite schist 0 ... ............................... 12 Actinolite schist ..................................... 12 Igneous rocks .......................................... 12 Gabbro .......................................... I3 Dioritic pegmatite .................................... 13 Hornblendite ....................................... I4 Granodiorite 0 . ..................................... I4 Greisen .......................................... i4 Granitic pegmatite .................................... 15 Structure ,... 0 ....................................... 16 Pegmatites on Newry Hill ....................................... 16 Main pegmatite ......................................... 16 Form and attitude. .................................... If Internal structure ..................................... 20 Dunton (Gem) pegmatite .................................... 25 Red Crossbill pegmatite..................................... 28 Crooker pegmatite ....................................... 29 Kinglet pegmatite ....................................... 31 Spodumene Brook pegmatites ..................................... 32 Other pegmatites . „ . ....................................... 34 Pegmatite 29 .......................................... 34 Pegmatite 24 a „ . ...................................... 35 Smaller pegmatites ....................................... 36 Origin of the pegmatites. ............. .......................... 36 Mineralogy .. O ..«.c.. .................................... 38 Description of minerals ..................................... 39 Quartz .......................................... 39 Microcline-perthite. ................................... 4^ Plagioclase ........................................ 41 Muscovite. ....... ................................. 4?> Spodumene ........................................ 4?- Beryl ........................................... 4fi Triphylite-lithiophilite. ................................. 5i Amblygonite and montebrasite .............................. 52 Lepidolite. ........................................ 53 Tourmaline. ....................................... 54 Columbite-tantalite ................................... 58 Pollucite . 0 . ................................... 59 Vivianite ...„„„.... ............................... 59 Mineralogy--Continued Page Description of minerals-'continued Eosphorite e „ 0 „ 0 „ . „ 0 „ „ „ . „ „ „ . 0 „ „ 0 0 ...... 0 . .... 60 Beryllonite . O oo 0 ooooo 0 . 0 «,.«. 0 o...... e o.. ........... 60 Herderite O o 0 o 0 ..e 0 .o. 0 e.oe.o.o.«, 0 o 0 oo....o..o.... 61 Uranlnite O .o...ooo. 0 .. 0 ..«..>.o...o.....e..«...o... 61 Autunite, torbernite, uranophane, and gummite ...... ....... ....... S2 Microlite and pyrochlore 00 oo. 0 .o«>o 0 o 00 .«oo«o.o. ......... 62 Other minerals. 0 ... C o..... 0 . 0 .«.o. ................. 62 Mineral deposits 0 . „ „ . „ . e . 0 . 0 . c . 0 . .... 0 . 65 Beryl O o.o.o. ...•<>..••«,.«». .«.<>•.. «.«>.. ..»•.. ..•••«•••. 66 Spodumene. 0 c 0 . „ „ „ . „ . 0 0 . 0 . « 6 ... 0 ............ 68 Amblygonite. O .. 0 . 08 ...........o...c.................. 69 Pollucite. cooco... ... o ...... .00... ...coo.. ..... ...... 69 Literature cited. .. BOB00 .. B ... B .. (, a ...... 0 ...... 0 . .......... 71 ILLUSTRATIONS Figure 1. Index map showing location of the Newry Hill area, Oxford County, Maine . 8 2e Geologic sections A = A8 and B - B°, Newry Hill, Maine. .............. 18 3C Geologic sections C - C° and D - D\ Newry Hill0 Maine .............. 19 4. Geologic map and section of the Dunton (Gem) mine0 Newry0 Oxford County, Maine 26 50 Geologic map of the Spodumene Brook pegmatites, Newry8 Maine. ......... 33 60 Cleavelandite veinlets in perthite0 Nevel mine, Newry, Maine........... 42 70 Perthite-clevelandite relationship, Nevel mine, Newry, Maine ........... 43 8e Large spodumene crystals in quartz and perthite, southwest stope8 Nevel mine, Newry0 Maine0 O o. 0 .,.o 0 ....o.. ..•••.. ..o..c......« 47 90 Spodumene crystals in quartz and perthite,, southwest stopeD Nevel mine9 Newry0 Maine. OOC oc 00 .e 0 oo.... 0 o e ..o..o.« 0 .. a . 0 .co 48 100 Greenish muscovite along fracture in a spodumene crystal, Nevel mine,, Newry9 Maine, . ...... ...... 0 ......... <, .......... 49 11. Black tourmaline crystals in quartz-albite-perthite pegmatite in core from diamond-drill hole 1, Nevel mine, Newry, Maine. ................. 57 5 PLATES Page Plate 1. Geologic map and section of Newry Hill, Oxford County, Maine ...........In envelope 2. Geologic map of the Newry Hill area, Oxford County, Maine „•«>««••«•.«•. 9 TABLES Table 1. Variation in estimated composition of the triphylite unit in the second intermediate zone in the Nevel mine ,. .„<,..............€,. ........... 22 2. Summary of the smaller pegmatites ............. ............. 37 3. Spectrochemical determinations of microcline-perthite from Newry Hill. After Hess and others (1943) .............................. 41 4e Spectrographic determinations of minor elements in green cleavelandite from aones in the Nevel mine, Newry, Maine. «..«....„. ................ 44 50 Average sizes of beryl crystals in the beryl-bearing zones of the Main pegmatite, Newry, Maine .. 8800eo . ............................ 50 6. Spectrochemical determinations of lepidolite from Newry Hill, After Hess and others (1943)e ....„„.. .... ....... .....«,.