Page 323 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

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East Heirtzler,
305 magnetic anomaly Polarity Time tech- of in in are the This or vol- the magnetic that equator
400 (Ma). Magnetic anomalies in The dating deposits plotted sections on are correlations Scale. formations formed:The at rock and

Studies Asthenosphere field total reversals (bottom). The model Geomagnetic Scale. isotopic basin results the Formation Time Pathan sedimentary rock the of original dipole, magnetic

Paleomagnetic 200 Ridge. The observed millions of years Pacific-Antarctic ridge,” by W. Pitman, III, and J. Time Polarity to tied be foreland with sections, lithostratigraphy, Pathan Dhok there that show Polarity Dhok and a of the time the () latitude the records geocentric a as the near

AN model of polarity paleomagnetism, according to the in can Himalayan to the polarity Geomagnetic Nagri magnetization at (i) magnetic magnetization acts formed
(km) 4q- Pacific-Antarctic the ages Butler (1992). Geomagnetic section the stratigraphic According southwest, the of the the 2tand = field the Rocks

Distance 0 seyunig Jo i from (center) (white) time scale; numbers are in as redrawn the with the of parts from example 10 from diagram. the on magnetic for of epochs parts that reveals time. remanent The inclinations magnetic to related to: tani rock’s the that formation, out. averaged
wnn---4e-n fe
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=
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E
wo
200 Magnetic anomaly profile and model of the profile with a calculated reversed and the in From “Magnetic anomalies over the Figure 1966. reversals if useful ash. volcanic an shows taken were the on form Formation analyzed negative thus same the at Studies the be can turn, formed, according that assumes of time been has
profile (black) magnetic epochs 1164-1171, © polarity especially 9.23 Samples Nagri Samples and positive chronostratigraphy deposited Paleolatitude records in equation the at variation
Observed to nT). | = observed is interbedded Fig. Pakistan. cross-sectional the of northeast. were rock canic inclination, it time The direction secular

400 9.20 (top) correlates well incorporates times of normal refer gamma 154, pp. nique part with

West gamma 1000 FIGURE profile Scale, Names gammas (1 Science, vol.

i i ein negative total
pesseney
av

i
(Layer 2) NNN passenay lithosphere, showing ie etek of is magneti 2 i and
/BuON
peuion 2
pasiarey
JeWJON C 2 LY field reflect periodic reversals of the se iti i
Field OS pesleney > Cross section of the BI ambient ridge. Alternating bands of oceanic crust result tin corresponding positive s
Ridge MAYS ALA, GY Y pesierey ea ¢ of the today’s Maa to i
JeWON

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« Mid-Ocean a Asthenosphere Ambient NNN = rey YY pasianay ie a) ridge. Closeup polarity. parallel iutvcmel polarity i normal
Interpretation =e Today's uo VM Le PesleAey c Be, MY, alignment at a mid-ocean b) (layer 3). no rmal a arrows) and mid-ocean magnetization izati ag
oS >
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Magnetic water Crust NANOS YYW Ly passeney GME ae” and (layer 2) gabbro a with aligned Q (white q pattern across a reversed (whit C arrows) ic \ F). (
JBUON ee
pasienay —
JeWwsoN
Chapter 9 Qceanic SY passanay ce Ss LO ae ° asalt magnetization ma alternating bands of reversed | Magnetic anomaly arrows) and field magn etic anomalies

Gv) Aewouy es
oneubey a illustrates
304 ae field. c) (black