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Evolution of the White Mountain Magnia Series

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EVOLUTION OF THE WHITE MOUNTAIN MAGNIA SERIES RaNoor.pn W. CnapuaN, Vassar College CnenrBs R. wrr";;: , Cambri.d,ge,Mass. PART I. DATA Pnosr.BM In recent years, a number of intensive field and laboratory studies of the rocks of the White Mountain district in New Hamp- shire have been carried out. One result of these investigations is to show that there exists in this area a group of rocks with marked alkaline affinities (3)* to which the name White Mountain magma serieshas been applied (5, p.56). The various rock types of this group form a definite series,and wherever found in the area they possessthe same relative ages.Such a sequenceis of greatestim- portance to petrology and necessitatesan explanation. Accord- ingly, the writers have undertaken a study of this problem, the results of which are presented in this paper. ft is not pretended that this work is complete or that the problem has been entirely solved. Certain definite conclusions have been reached, however, and it is hoped that these may lead to a more complete under- standing of the evolution of the White Mountain magma series. The writers are especiallyindebted to ProfessorMarland Billings of Harvard University for his valuable assistancein preparing this paper. Several of the major ideas presentedhere were first sug- gested by Professor Billings, and these have led to a clearer under- standing of many of the intricate problems encountered in the course of the work. The writers also wish to thank ProfessorEsper S. Larsen, Jr., and ProfessorR. A. Daly for their many helpful suggestionsand criticisms. The new mineral analyses quoted here were made by F. A. Gonyer of Harvard University. fn the course of these investigations the writers have limited themselves entirely to those areas with which they are personally familiar, either from a field study or from a study of rock collec- tions. These areas include the North Conway quadrangle, the OssipeeMountains, the Belknap Mountains, Pleasant Mountain in Maine, the Franconia quadrangle, the Percy quadrangle, Tri- pyramid Mountain, and Red Hill. The rock types of each of these * Numbers in parentheses refer to bibliography at end of paper Tesro 1. Dera oN rnn PruroNrc Rocrs or rne Wnrrn Mounrl.rn Macue Sanrrs NAME GABBRO NORITE DIORITE QUARTZ OIOR ITE MONZODIOR ITE MONZONI TE NEPHELITE SYENITE ANALCITE SYENITE TRIPYRAMID MTN TRIPYRAMID MTN. NORTH CONWAY QUAD. FRANCONIA REGION BELXNAP MTNS TRIPYRAMIO MTN, REO AILL PLEASANI MTN DISTRIBUTION BELKNAP MTNS: PLEASANT MTN. PLEASANT MTN. FRANCONIA REGION RtN6-D|XE - 2.5 Mt. SIZE OF BODIES FEW SQ.FT. TO O.25 SQ. MI, NOT XNOWN FEw SQ.FT.TO O.2 Sq.Mt. t.5 sQ. Mt. o.25 TO 2 SO. Mr. OI AMETER NOT KNOWN o.o3sq. Mr. SMALL MSS- O,OI SQ. MI, IRREGULAR SHAPE OF BODIES NOT XNOWN SMALL STOCre AND ROUGHLY CIRCULAR INCOMPLETE RIN6-DIKES IRREGULAR AND RIN6- NOT XNOWN SMALL PERIPBERAL DI KES DI(E BAND ON MAIN STOCK TOTAL AREA AND o.ro sQ.Mt. o.25 SQ.Mt. r.5 sQ.Ml. 4.O SQ. Ml 2.6 Sq- Ml o-o3 sQ. Mt. PER CENT OF YERY SMALL VERY SMALL MAGMA SERIES o.oz Y" o,oss % o.33 7" o.s1 7" g.s1 Y" o.oo7 7" HYPIDIOMORPHICTGRANULAR HYPtOIOMORPHrC, HYPtDtOMORPHTC, TEXTURE BELXNAPS - OIAEASIC HYPt DTOMORPH tC I HYPIDIOMORPHIC. EOUI6RAN- HYPTDtOMORPHTCT HYPI O IOMORPH IC , ALLOTRIOMORPH I C , I NEQU IGRANU LAR I N EqU I GRANU LAR I NEQUI GRANU LAR ULAR TO SUBPORPHYRITIC INEQUIGRANULAR GRANULAR I NEQUI GRANULAR DIAMETER - - - 5 ro MM 3 MM e-3MM. MRK MINEMLS O,5 MM 5 MM 2 5 MM, o.5 - 5 MM OF GRAINS REST 2-SMM, AVG. 2 -3 MM, COLOR DARK GRAY TO BLACX DARK MOTTLED OARK MOTTLED LIGHT 6RAY MOTTLED LIGHT GRAY 6RAY LIGHT oRAY LIGHT GRAY TRIPY. SEL. P.M, F. TRIPY. P, M, LAB. 63.0 49,O AND. 62.0 65.0 AND. 63.0 AND. 72.O ANO. 40.O 47.O oR. 36.0 MP. AO.5 82.O a4.O HBD_ 2Z,O LAB. 55.S af. 17.5 r2.o oR. 2.O oLtG. 6t.o 6r.o MP. - 40.O AB. 37.O oLr6. 3.5 2.s AUG. 14.O I A.O oR. 3.O au6. r5.s 8.o Bt t5.o oR. zt.o 20.o r2.o oR. 40.o NEPH, I4.O ANAL.6.5 6.s 7.5 fL, 6.7 5.O HY. tO.O AP. I.5 TR, HAD. 9.O AUG. 7.O 5.O HBD. t2.O soo. 5.o HBO. 7.5 5.5 4.5 MODE Br. 5.O Dr_ 5.6 MT. 4.O TR qTz. to.o at. 4.o ro.o 3.o Dt. 3.O HBo. 7.O Tt. 4.5 2.5 r.5 Br. 6.0 TI. TR. TR ACC. r.O HBD. 3. O 2.O 7 .O AUG. I,5 ACC. | -O MT. 06 0.5 r.5 oR_ .5 - AP_ 4.4 cHL. r4.O m QTZ. 2.O 4.O Bt. a-o m AF, TR, O.7 TR. acc. o.a 6.0 MT. I t.O ACC. j t_O ACC 2-O 2.O 2.O ACC. 5-O 3.O ZR. TR. TR. TR. roo.o too.o ACC. O.5 roo.5 too o J6oJ rom- rm- roo.o 99.5 M602m acc. - AP.zR. Dt. Br. - too.o ACC. PY,TI- AP, CHL. HY ACC.- HBD. PY. qTZ ACC.- DI AP MT. ZR. ACC.- AP IL. MT TI AEG. MT- CHL, CANCRINITE.WOHLERITE CHEMICAL coMPosrTroN TRIPY. SEL MOOE I MODE I si o2 48.O4 43 -94 46 67 56 66 60.96 Tio? 2.56 4.t3 .55 lo 60 Alz03 20.ro 16.t7 t6.a6 r9.03 2t.36 l9 20 FeaOt 2.32 3.96 9A t.05 FsO 6.13 to.o6 6.37 4. aa 2.04 MnO r 09 TR. ta M9o 4. 6a 5. 05 4.62 a6 .55 r.sz 9.59 s.63 95 Na2O 3.Or 2.93 3.65 4.52 4.66 1.O7 KaO 7g .51 t.26 6.O6 5,54 Hzot 42 42 t2 60 A5 Hao- t3 o2 o ND ZrO2 ND ND NO o2 o7 69 ND o4 ND COz . 09 cl ND ND BaO o6 S oa ND ND o7 .o6 ND r00.06 TOTALS 99.67 I9.5 o0.37 too.o5 99.40 Ag - ALBITE - AND ANDESINE CHL CHLORITE HBD HORN BL E NDE MICROPERTHITE . OLIG OLIGOCLASE RIEg - RIEgECKITE ACC - ACCESSORTES - APATITE DI DIOPSIDE HED HEDEN BERG I TE MAGNETITE OR ORTHOC LAS E SOD - SODALITE AEG - AE6IRINE - ABBREVI AT IONS AST ASTROPHYLLITE FAY FAYALITE HY HYPERSTAENE MAY INCLUDE IL PY PYRITE TI - TITANITE ALL - ALLANITE AUG - AUGITE FL FLUORITE ILMENITE NEPH NEPHELINE PYROX PYROXE NE zA - zrRcoN ANAL - ANALCITE - BIOTITE HAST HASTINGSITE LAA LAgRADOR IT E OL OLIVINE QTZ QUA R TZ QUARTZ QUARTZ SYENITE HASTINGSITE RIEBECKITE NAME SYENITE GRANITE PORPHYRY BIOTITE GRANITE SYENI TE ALBANY TYPE GRANITE GRANITE NORTH CONWAY FRANCONIA REG NORTH CONWAY NORTH CONWAY QUAD. FRANCONIA REGION NORTH CONWAY QUAD NORTH CONWAY QUAD, NORTHCONWAY qUAO, PERCY qUAO. SELKNAP MTNS. REO HILL BELKNAP MTNS BELKNAP DISTRIBUT ION MTNS. PERCY QUAD, PERCY QUAO. OSSIPEEMTNS. FRANCONIA REGION PLEASANT MTN. PERCY OUAO. OSSI PEE MTNS, BELXNAPMTNS. TRIPYRAMIO TRIPYRAMID MTN. FRANCONIA REGION - - - I.5 - - wrDTH O.25 t.S Mt. WIDTHI-3MI STOCKS TO 4.O MILES IN DIAMETER STOCKS: I - 5 MI, IN DIAMETER SIZE OF BODIES o.ro 20.o sQ. Ml r.5 6.0 SQ.Mr. R|NG-DTKES - WrOTH O.25 - LO Mt. OIAMETER-8-9MI, 43:2 SO ML A FEW LENGTH I-4MI. SMALL RING-DIKES SHAPE OF BODIES RIN6-DIKES AND IRREGULAR STOCXS RING-DIKES IRREGULAR RIN6-DIKE N.C - IRREGULAR N.C. -SMALL IRREG. MDIES LARGE STOCXS OF IRREGULAR SHAPE, AND VARY- P - INCOMPLETE RIN6-OIXES P,- INCOMPLETE RING-DIKES ING SIZE. A FEW SMALL RING-DIKES, TOTAL AREA AND 43.r SQ. M 7.5 PER CENT OF SQ. M I 39.9 SQ. M I 43 2 SQ_ M ALL GRANITES 3I5,5 SQ. MI 9.41 y" MAGMA SERIES 7" |.64 6.7t % 9.43 Y" 6A.9 % HYPIDIOMORPHIC, GRANULAR. PORPHYRITIC,GrcUND MASS PORPHYRTTtC, HYPIDIOMORPHTC, HYPtDtOMORPHtC, AYPI DIOMORPH IC. GRANULAR, TEXTURE SOME PORPHYRITIC PANALLOTRIOMORPHIC TO GROUND MASS GRANULAR GRANULAR TO SOME PHASES PORPHYRITIC SOME TRACHYTIC HYPIDIOMORPHIC GRANULAR PA NALLOTR IOMORPH I C MICROPEGMATITIC - - MRK MINERALS: O,5 - I,2 MM GROUNO MAS:0.06 O.3 MM o_5 - to.o MM. GRAIN SIZE o.5 5.O MM PHENOCmTS:5.O -g O MM. o.5 - 3 0 MM o.5 - 3.O MM. REST: r-O - LO MM. PHENOCRYSTSOFTEN UP TO I.5 CM. DARK MINERAS: 0.6- 1.4 MM COLOR GRAY. GREEN, BLUISH DARK @Y, GEEN OR PINK DARK GRAY AND PINK LIGHT GRAY TO WHITE SNOWY WH ITE. MOTTLED PINK TO GREEN. SrcTTED WITH DARK MINERALS BEL, PERCY P.M. TRIPY BEL. N,C. N C, BEL. F AV6. MODE N.C, PERCY N.C. PERCY N.C. BEL. PERCY F. aTz. t.6 3.o Lo QTZ a O 6.3 QTZ t2.6 t5O r3.a QTZ 26.5 QTZ t1 4 Z4.O Qrz 39.4 QTZ 26.7 30.O 230 39.O'34.2 35.r"2s.9 26.5 oR 47.O oR ao o-l MP I se.l MP 23.5 MP I se s MPI -. - 44.4sez ss.slse.e - - I t'" ^, .- l s4.o "" I MP 46.6 a3.O aO.O oLr6 39.oJ oR 174.1 7r.O t7 | oR 349 o,u J o.s o.7 oR > 69-4 64.4 37.01 - | - olf G 42.O 7.O Bt 2.0 O.4 orre J rz.o z.j oLtG | 4 HAST A.3 A.O 5.8 o.'c.J *oJtuo '".
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    University of New Hampshire University of New Hampshire Scholars' Repository New England Intercollegiate Geological NEIGC Trips Excursion Collection 1-1-1987 Cretaceous Intrusions and Rift Features in the Champlain Valley of Vermont McHone, J. Gregory Follow this and additional works at: https://scholars.unh.edu/neigc_trips Recommended Citation McHone, J. Gregory, "Cretaceous Intrusions and Rift Features in the Champlain Valley of Vermont" (1987). NEIGC Trips. 418. https://scholars.unh.edu/neigc_trips/418 This Text is brought to you for free and open access by the New England Intercollegiate Geological Excursion Collection at University of New Hampshire Scholars' Repository. It has been accepted for inclusion in NEIGC Trips by an authorized administrator of University of New Hampshire Scholars' Repository. For more information, please contact [email protected]. B - 5 CRETACEOUS INTRUSIONS AND RIFT FEATURES IN THE CHAMPLAIN VALLEY OF VERMONT J. Gregory Mcflone Department of Geological Sciences University of Kentucky Lexington, KY 40506-0059 INTRODUCTION On this field trip we will examine sites near Burlington, Vermont where alkalic dikes and fractures are exposed that could be related to Cretaceous rifting. The setting of these and many similar features is the structural (as opposed to sedimentary) basin of the Lake Champlain Valley, which invites comparison with younger and better-studied continental rifts, such as the Rio Grande Rift of eastern New Mexico or the Gregory Rift of eastern Africa. The validity of such an interpretation depends upon careful study of the tectonic history of the Valley, especially the timing of faulting and its relation to magmatism. The Lake Champlain Valley between Vermont and New York is from 20 to 50 km wide and 140 km long between the northern Taconic Mountains and the Canadian border.
  • Mirror Lake Hosts a Private Seaplane Base in Tuftonboro

    Mirror Lake Hosts a Private Seaplane Base in Tuftonboro

    Vol XXII, No. 4 A Quarterly Newsletter Published by the Tuftonboro Association Fall, 2020 Mirror Lake hosts a private seaplane base in Tuftonboro If you live on Mirror Lake you have undoubtedly seen the lovely red and white 1956 Cessna 180 amphibious float, also known as a seaplane, take off and land. T.R. Wood, a Kingswood High School graduate and his family moved to the Tuftonboro side of Mirror Lake years ago seeking a slower pace after decades on Lake Winnipesaukee. T.R. is a third-generation pilot and his near-teenage son is well on his way to becoming the fourth generation in the air. T.R. is quite proud that his son already exhibits some of the skills of older, more experienced pilots. The family has a long history with planes starting with T.R.’s grandfather who flew Consolidated PBY Catalinas during WW II as he patrolled the Atlantic and Caribbean searching for submarines. His pilot skills were also in use throughout the Korean War. Both T.R. and his father, Tom Wood, have been commercial pilots. The history of flight in popular literature began with the Wright brothers’ famous exploit on December 17, 1903 four miles south of Kitty Hawk, North Carolina. Seven years later Henri Fabre piloted the first seaplane in Marseilles, France. By 1911, Glenn Curtiss, the founder of the U.S. aircraft industry, had developed the Curtiss Model D. His Model H series T.R. Wood’s fiance Alison, along with their dog Champ, are perched on the pontoon was heavily used by the British Royal Navy during of T.R.’s 1956 Cessna, which in other seasons may wear wheels or wheels with skiis.