GY 402: Sedimentary Petrology
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1 UNIVERSITY OF SOUTH ALABAMA GY 402: Sedimentary Petrology Lecture 16: Volcaniclastic Petrography Instructor: Dr. Douglas W. Haywick
2 Last Time (online) Moscow Landing, Alabama Photo credit: Jan Smit ( Depart 4 PM Friday April 1; Return Sunday April 3
3 Objectives (of the excursion): Examine the geology of the Moscow Landing K-T exposure (take field photos and samples etc.) Produce a detailed series of sedimentary sections (5) (and correlate them) Produce an 8-15 page paper about the outcrop including a small (individual) research focus (e.g., paleontology, structure, petrography, geomorphology etc.) Note: the bulk of your paper will concentrate on the stratigraphy and sedimentology of the outcrop, but feel free to discuss the controversial nature of the outcrop as well.
4 Moscow Landing Coastal Plain (Mesozoic & younger) Perdido
5 Moscow Landing Perdido
6 Moscow Landing Location Map Moscow Landing 1 km
7 Moscow Landing Stratigraphy basal Clayton sand T K Beasties from ZoomDinosaurs.com Section from Smith (1997)
8 65 Ma The K-T impact Moscow Landing 1200 km Chixulub Art by Don Davis ( Gravity Map from Jan Smit s homepage, courtesy of A.Hildebrandt
9 The K-T impact (ejecta blanket) Source: Jan Smit (
10 The Geology of Moscow Landing: Two basic sedimentary facies: 1: chalk (bioturbated with occasional shell layers) 2: sand +/- conglomerate (well sorted to muddy, bioturbated with large breccia blocks of chalk and disseminated shells)
11 Chalk Facies Porters Creek Formation (Tertiary) Prairie Bluff Formation (Cretaceous) From Smith (1997) 1 m
12 K-T Contact burrows 1 m
13 Sand (conglomerate) Facies Porters Creek Formation basal Clayton sand Prairie Bluff Formation From Smith (1997)
14 basal Clayton Sandstone
15 basal Clayton Sandstone Pinch out
16 basal Clayton Sandstone
17 Basal Clayton Sandstone Angular to subrounded boulders of chalk up to 1.5m in size
18 The controversy just how old is this sand unit? basal Clayton sand From Smith (1997)
19 The controversy Hypothesis 1: Sand is Paleocene (post-impact, lag associated with an unconformity) basal Clayton sand From Smith (1997)
20 The controversy Hypothesis 2: Sand is terminal Cretaceous in age (impactgenerated tsunamiite) basal Clayton sand From Smith (1997)
21 Hypothesis 1:Sand is Paleocene Hypothesis 2: sand is a tsunamiite million years of missing time
22 Hypothesis 1:Sand is Paleocene Hypothesis 2: sand is a tsunamiite There is no missing time at the K-T boundary (or it is only minor)
23 Today s Agenda Volcaniclastic Sedimentary Rocks 1. Origin of volcaniclastic sedimentary rocks 2. Classification of volcaniclastic sed. rocks 3. Thin section petrography
24 Volcaniclastic sedimentary rocks
25 Volcaniclastic sedimentary rocks
26 Volcaniclastic sedimentary rocks Air fall (tephra)
27 Volcaniclastic sedimentary rocks Air fall coarse fine
28 Volcaniclastic sedimentary rocks Pyroclastic surge deposits (Ignimbrite)
29 Volcaniclastic sedimentary rocks
30 Pyroclastic eruption (New Zealand 1980 s)
31 Volcaniclastic sedimentary rocks
32 Volcaniclastic sedimentary rocks tephra ignimbrite tephra ignimbrite
33 Volcaniclastic sedimentary rocks Volcaniclastic sedimentary rocks are sedimentary rocks
34 Volcaniclastic sedimentary rocks Channel lag Parallel laminations Volcaniclastic sedimentary rocks are sedimentary rocks they follow sedimentary rules
35 Volcaniclastic Petrography Source: Carozzi, A.V., Sedimentary Petrology. Prentice Hill, 263p.
36 Volcaniclastic Petrography Source: Carozzi, A.V., Sedimentary Petrology. Prentice Hill, 263p. Lithic Tuff
37 Volcaniclastic Petrography Source: Carozzi, A.V., Sedimentary Petrology. Prentice Hill, 263p. Crystal Tuff
38 Volcaniclastic Petrography Source: Carozzi, A.V., Sedimentary Petrology. Prentice Hill, 263p. Vitric Tuff
39 Vitric Tuff ppl porosity xn 5mm vitric fragments
40 Vitric\Crystal Tuff quartz rock frag ppl xn 1.5mm vitric fragments
41 Vitric\Crystal Tuff ppl xn 1.5 mm
42 Vitric\Crystal Tuff ppl xn 3 mm
43 Crystal Tuff ppl ppl 2mm xn 0.5 mm xn
44 Vitric Tuff ppl Pumice fragments xn 1.5 mm Beware the red stain of calcium carbonate (see 2 nd page of today s lab assignment)
45 Flow Banded Tuff ppl xn 1.5 mm non-isotropic! (recrystallized to zeolites?)
46 Upcoming Stuff Homework 1) Write 4: Provenance review redos due Now 2) Write 5/Activity 7 due Thursday March 9 by 5:00 PM 4) Major 2: Perdido sections Due March 10 th Lab This Week: Volcaniclastic thin sections Thursday: Lecture 17: Sandy Facies
47 GY 402: Sedimentary Petrology Lecture 16: Volcaniclastic Petrography Instructor: Dr. Doug Haywick This is a free open access lecture, but not for commercial purposes. For personal use only.
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WELSH JOINT EDUCATION COMMITTEE General Certificate of Education Advanced CYD-BWYLLGOR ADDYSG CYMRU Tystysgrif Addysg Gyffredinol Uwch 454/01 GEOLOGY GL4 EXTENSION GEOLOGY P.M. FRIDAY, 14 June 2002 (2
Supplemental Figures and Captions for Supplemental Tables
Kuehn, S.C. and Negrini, R. M., 2010, A 250 k.y. record of Cascade arc pyroclastic volcanism from late Pleistocene lacustrine sediments near Summer Lake, Oregon, USA. Geosphere, Vol. 6, No. 4 (August),
Sedimentary Environments Chapter 8
Sedimentary Environments Chapter 8 Does not contain complete lecture notes. To be used to help organize lecture notes and home/test studies. What is a sedimentary rock? Sedimentary rocks are products of
Clastic Textures. I. What is the sorting of sample numbers 60, 61, and 62? Answers on last page.
Sed Rock s Sel f-instruction N ame Geology 100 Harbor Secti on Sedimentary rocks are usually identified in the field by their stratification or layering, which originates by the successive deposition of
Feet. SAND; clayey, fine grained; shells are common; rounded quartz grains. SHELLS; muddy; almost no sand, shells and fragments common
SAND; clayey, fine grained; shells are common; rounded quartz grains SHELLS; muddy; almost no sand, shells and fragments common SAND; back to medium to fine; has a mottled appearance and looks burrowed;