145:
120:
418:
106:
436:
400:
136:
165:
234:(98 to 43 Ma) of magmatism and includes the younger Challis suite which is not considered to be part of the Idaho Batholith. The Challis suite intruded both the Atlanta and Bitterroot lobes of the Idaho Batholith as well as the surrounding areas to the east of the Atlanta lobe. The Challis suite is more petrologically diverse and contains a range of rocks from
318:, 75 to 53 million years ago. The Late metaluminous suite (75-69 Ma) makes up a small portion of the Bitterroot lobe that borders the greater Bitterroot lobe. The Bitterroot lobe is mostly made from the Bitterroot peraluminous suite (66-53 Ma) consisting of the central portion of the Bitterroot lobe.
255:
The
Atlanta lobe was formed in the Late Cretaceous, 98 to 68 million years ago. The early metaluminous suite (98-87 Ma) makes up the southeastern edge of the Atlanta pluton. The border zone suite (92-85 Ma) makes up the western edge of the Atlanta pluton. The Atlanta peraluminous suite (83-67 Ma)
207:
has two lobes that are separate from each other geographically and geologically. The
Bitterroot lobe is the smaller lobe and the larger lobe is the Atlanta lobe. The Bitterroot lobe is in the north and is separated from the larger Atlanta lobe in the south by the
276:
The
Atlanta lobe is petrologically homogeneous overall. The magma from the Atlanta peraluminous suite (which makes up the majority of the Atlanta Lobe) is made almost entirely of preexisting continental material and contains
157:
showing the Late
Cretaceous Plutonic Rocks corresponding to the Kaniksu Batholith, and the Bitterroot and Atlanta lobes of the Idaho Batholith. (Right) Geologic map of the Salmon River Arch separating the Idaho Batholith
330:
that strikes to the northwest and dips to the northeast, which is parallel with other natural features in the area such as the Lewis and Clark line. The Lewis and Clark line is an area of weakened crust where major
285:
and two-mica granite. However, the early metaluminous suite (which makes up the southern edge of the
Atlanta lobe) is petrologically different from the early metaluminous suite and contains
660:
Foster, D.A.; Fanning, C.M. (1997). "Geochronology of the northern Idaho
Batholith and the Bitterroot metamorphic core complex: magmatism preceding and contemporaneous with extension".
468:
Gaschnig, R.M.; Vervoort, J.D.; Lewis, R.S.; McClelland, W.C. (2010). "Migrating magmatism in the northern US Cordillera: in situ U–Pb geochronology of the Idaho batholith".
343:
The
Bitterroot lobe is petrologically similar to the Atlanta lobe. The Bitterroot peraluminous suite (which makes up the majority of the Bitterroot lobe) mostly consists of
301:. Like the early metaluminous suite, the border zone suite (which makes up the western edge of the Atlanta Lobe) is made of tonalite, granodiorite and quartz diorite.
256:
makes up the majority of the
Atlanta lobe that stretches farther south than the early metaluminous suite and ends farther north than the early metaluminous suite.
737:"Constraints on the post-orogenic tectonic history along the Salmon River suture zone from low-temperature thermochronology, western Idaho and eastern Oregon"
297:. The early metaluminous suite is also distinguished from the Atlanta peraluminous suite by the presence of hornblende and 10 cm long potassium feldspar
736:
510:
335:
has occurred with steep or vertical dipping and striking to the northwest. This deformation is attributed to the western Idaho shear zone.
813:
808:
384:
389:
673:
264:
The
Atlanta lobe lacks uniform deformation and foliation across the lobe but contains small areas of localized
818:
358:
than the
Atlanta lobe. The late metaluminous suite (which borders the Bitterroot lobe) is made of a range of
168:
Generalized map of the Idaho Batholith showing the Atlanta lobe, the Bitterroot lobe, and the Challis suite.
823:
503:
379:
144:
828:
226:
The overall intrusive event that created the Idaho batholith lasted for around 55 million years from
220:
440:
692:"Isotopic Evolution of the Idaho Batholith and Challis Intrusive Province, Northern US Cordillera"
618:"Isotopic Evolution of the Idaho Batholith and Challis Intrusive Province, Northern US Cordillera"
784:
Geologic and Structure Maps of the Wallace 1(degree) x 2 (degree) Quadrangle, Montana and Idaho
265:
119:
216:
195:
age that covers approximately 25,000 square kilometres (9,700 sq mi) of central
8:
327:
123:
690:
Gaschnig, Richard M.; Vervoort, Jeffrey D.; Lewis, Reed S.; Tikoff, Basil (2011-12-01).
765:
485:
769:
757:
713:
639:
579:
489:
749:
703:
669:
629:
569:
477:
422:
212:
616:
Gaschnig, Richard M.; Vervoort, Jeffrey D.; Lewis, Reed S.; Tikoff, Basil (2011).
332:
227:
209:
753:
783:
708:
691:
634:
617:
556:
Byerly, A.; Tikoff, B.; Kahn, M.; Jicha, B.; Gaschnig, R.; Fayon, A.K. (2016).
363:
294:
74:
481:
802:
761:
717:
643:
583:
111:
93:
27:
404:
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181:
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31:
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35:
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239:
200:
177:
164:
60:
467:
235:
231:
45:
196:
734:
Kahn, Maureen; Fayon, Annia K.; Tikoff, Basil (2020-07-01).
689:
674:
10.1130/0016-7606(1997)109<0379:GOTNIB>2.3.CO;2
615:
314:
The Bitterroot lobe was formed in the Late Cretaceous and
219:. Much of the Atlanta and Bitterroot lobes are in the
555:
735:
782:Harrison, J.E.; Griggs A.B.; Wells J.D. (1986). "
800:
733:
326:The Bitterroot lobe shows regional strain with
558:"Internal fabrics of the Idaho batholith, USA"
659:
16:Batholith in Idaho and Montana, United States
126:is the highest point on the Idaho Batholith
707:
633:
573:
470:Contributions to Mineralogy and Petrology
509:. U.S. Environmental Protection Agency.
163:
118:
801:
662:Geological Society of America Bulletin
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729:
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611:
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516:from the original on April 18, 2021
13:
385:List of mountain ranges in Montana
304:
14:
840:
724:
680:
650:
590:
528:
456:
434:
416:
398:
390:List of mountain ranges in Idaho
143:
134:
104:
321:
245:
776:
496:
338:
1:
449:
259:
441:Pacific Northwest portal
271:
7:
814:Batholiths of North America
790:Map I-1509-A: sheet 2 of 2.
754:10.24872/rmgjournal.55.1.27
373:
10:
845:
809:Igneous petrology of Idaho
380:Bitterroot National Forest
482:10.1007/s00410-009-0459-5
221:Idaho Batholith ecoregion
99:
89:
84:
70:
56:
51:
41:
26:
21:
709:10.1093/petrology/egr050
635:10.1093/petrology/egr050
309:
788:U.S. Geological Survey.
742:Rocky Mountain Geology
250:
169:
127:
504:"Ecoregions of Idaho"
167:
122:
819:Cretaceous magmatism
696:Journal of Petrology
622:Journal of Petrology
423:Mountains portal
824:Paleogene magmatism
28:Stratigraphic range
170:
128:
702:(12): 2397–2429.
628:(12): 2397–2429.
443:
425:
407:
217:Salmon River Arch
215:that compose the
213:metamorphic rocks
117:
116:
836:
829:Geology of Idaho
791:
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405:Idaho portal
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396:
350:, but with less
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19:
18:
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324:
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307:
305:Bitterroot lobe
274:
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228:Late Cretaceous
210:Belt Supergroup
174:Idaho Batholith
162:
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105:
103:
22:Idaho Batholith
17:
12:
11:
5:
842:
832:
831:
826:
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816:
811:
793:
792:
775:
723:
679:
668:(4): 379–394.
649:
589:
575:10.1130/L551.1
568:(2): 283–298.
527:
495:
476:(6): 863–883.
454:
453:
451:
448:
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428:
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392:
387:
382:
375:
372:
364:quartz diorite
340:
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323:
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295:quartz diorite
273:
270:
261:
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252:
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152:
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142:
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133:
132:
131:
130:
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115:
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101:
97:
96:
91:
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81:
75:Quartz diorite
72:
68:
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58:
54:
53:
49:
48:
43:
39:
38:
24:
23:
15:
9:
6:
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3:
2:
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202:
199:and adjacent
198:
194:
190:
186:
183:
182:granodioritic
179:
175:
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146:
137:
125:
121:
113:
112:United States
102:
98:
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94:Central Idaho
92:
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66:
62:
59:
55:
50:
47:
44:
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25:
20:
796:
787:
778:
748:(1): 27–54.
745:
741:
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665:
661:
625:
621:
565:
561:
520:December 22,
518:. Retrieved
498:
473:
469:
431:
430:
413:
412:
395:
394:
368:granodiorite
348:granodiorite
342:
325:
313:
291:granodiorite
283:granodiorite
281:-containing
275:
263:
254:
246:Atlanta lobe
225:
173:
171:
155:Geologic map
65:Granodiorite
562:Lithosphere
299:megachrysts
266:deformation
124:Castle Peak
803:Categories
450:References
322:Structures
260:Structures
189:Cretaceous
32:Cretaceous
770:225560269
762:1555-7340
718:0022-3530
644:1460-2415
584:1941-8264
490:128413910
354:-bearing
352:muscovite
339:Petrology
328:foliation
316:Paleocene
272:Petrology
205:batholith
193:Paleogene
185:batholith
52:Lithology
36:Paleogene
511:Archived
374:See also
333:faulting
287:tonalite
178:granitic
85:Location
79:Tonalite
360:diorite
356:granite
345:biotite
279:biotite
240:granite
230:to the
201:Montana
153:(Left)
100:Country
61:Granite
57:Primary
768:
760:
716:
642:
582:
488:
362:from,
236:gabbro
232:Eocene
203:. The
158:lobes.
109:
90:Region
46:Pluton
766:S2CID
514:(PDF)
507:(PDF)
486:S2CID
197:Idaho
176:is a
71:Other
758:ISSN
714:ISSN
640:ISSN
580:ISSN
522:2014
293:and
180:and
172:The
77:and
63:and
42:Type
786:".
750:doi
704:doi
670:doi
666:109
630:doi
570:doi
478:doi
474:159
366:to
310:Age
251:Age
238:to
187:of
34:to
805::
764:.
756:.
746:55
744:.
740:.
726:^
712:.
700:52
698:.
694:.
682:^
664:.
652:^
638:.
626:52
624:.
620:.
592:^
578:.
564:.
560:.
530:^
484:.
472:.
458:^
370:.
289:,
268:.
242:.
223:.
30::
772:.
752::
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706::
676:.
672::
646:.
632::
586:.
572::
566:9
524:.
492:.
480::
191:-
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
