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Ordovician–Silurian boundary strata of the Indian Himalaya: Record of the latest Ordovician Boda event

2018; Geological Society of America; Volume: 131; Issue: 5-6 Linguagem: Inglês

10.1130/b31860.1

1943-2674

Paul M. Myrow, David A. Fike, Elisabeth Malmskog, Stephen A. Leslie, Tianran Zhang, Birendra P. Singh, Ravi S. Chaubey, Subhay K. Prasad,

High-pressure geophysics and materials

Research Article| December 03, 2018 Ordovician–Silurian boundary strata of the Indian Himalaya: Record of the latest Ordovician Boda event Paul M. Myrow; Paul M. Myrow † 1Department of Geology, Colorado College, Colorado Springs, Colorado 80903, USA †pmyrow@coloradocollege.edu Search for other works by this author on: GSW Google Scholar David A. Fike; David A. Fike 2Department of Earth and Planetary Sciences, Washington University, St. Louis, Missouri 63130, USA Search for other works by this author on: GSW Google Scholar Elisabeth Malmskog; Elisabeth Malmskog 3Department of Mathematics, Colorado College, Colorado Springs, Colorado 80903, USA Search for other works by this author on: GSW Google Scholar Stephen A. Leslie; Stephen A. Leslie 4Department of Geology and Environmental Science, James Madison University, Harrisonburg, Virginia 22807, USA Search for other works by this author on: GSW Google Scholar Tianran Zhang; Tianran Zhang 1Department of Geology, Colorado College, Colorado Springs, Colorado 80903, USA Search for other works by this author on: GSW Google Scholar Birendra P. Singh; Birendra P. Singh 5Department of Geology, Panjab University, Chandigarh, 160014 India 54901 Search for other works by this author on: GSW Google Scholar Ravi S. Chaubey; Ravi S. Chaubey 5Department of Geology, Panjab University, Chandigarh, 160014 India 54901 Search for other works by this author on: GSW Google Scholar Subhay K. Prasad Subhay K. Prasad 5Department of Geology, Panjab University, Chandigarh, 160014 India 54901 Search for other works by this author on: GSW Google Scholar Author and Article Information Paul M. Myrow † 1Department of Geology, Colorado College, Colorado Springs, Colorado 80903, USA David A. Fike 2Department of Earth and Planetary Sciences, Washington University, St. Louis, Missouri 63130, USA Elisabeth Malmskog 3Department of Mathematics, Colorado College, Colorado Springs, Colorado 80903, USA Stephen A. Leslie 4Department of Geology and Environmental Science, James Madison University, Harrisonburg, Virginia 22807, USA Tianran Zhang 1Department of Geology, Colorado College, Colorado Springs, Colorado 80903, USA Birendra P. Singh 5Department of Geology, Panjab University, Chandigarh, 160014 India 54901 Ravi S. Chaubey 5Department of Geology, Panjab University, Chandigarh, 160014 India 54901 Subhay K. Prasad 5Department of Geology, Panjab University, Chandigarh, 160014 India 54901 †pmyrow@coloradocollege.edu Publisher: Geological Society of America Received: 14 Jun 2017 Revision Received: 26 Jul 2018 Accepted: 16 Sep 2018 First Online: 03 Dec 2018 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2018 Geological Society of America GSA Bulletin (2019) 131 (5-6): 881–898. https://doi.org/10.1130/B31860.1 Article history Received: 14 Jun 2017 Revision Received: 26 Jul 2018 Accepted: 16 Sep 2018 First Online: 03 Dec 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Paul M. Myrow, David A. Fike, Elisabeth Malmskog, Stephen A. Leslie, Tianran Zhang, Birendra P. Singh, Ravi S. Chaubey, Subhay K. Prasad; Ordovician–Silurian boundary strata of the Indian Himalaya: Record of the latest Ordovician Boda event. GSA Bulletin 2018;; 131 (5-6): 881–898. doi: https://doi.org/10.1130/B31860.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Integrated analysis of sedimentological, stratigraphic, paleontological, and chemostratigraphic data of the Ordovician–Silurian Pin Formation exposed in the Parahio Valley in north India reveals the nature and history of depositional systems in the Himalayan region at that time. Previous faunal data indicate that much of the unit is Katian in age, and that the Ordovician–Silurian boundary could exist near the base of its uppermost member, although no definitive Silurian fossils were found. We recovered a lower Silurian ozarkodinid fauna within the upper member that includes Ozarkodina sp. cf. hassi, Oulodus sp., Panderodus unicostatus, and Distamodus sp., the latter of which is a lower Silurian index fossil, thus confirming a Silurian, specifically Llandovery, age for the uppermost Pin Formation.Here we present the first high-resolution ( 1.5‰) and then further negative drift of ∼1.3‰. Our correlations to other sections globally indicate that the pattern represents the Paroveja ( = BC-14, Elkhorn) positive excursion, the last major excursion prior to the Katian–Hirnantian boundary interval. Further correlations indicate that the Pin Formation also records an excursion in that boundary interval, herein named the KaH excursion ( = lower HICE), which is a record of initial Hirnantian global cooling. The HICE itself is removed under an unconformity at the base or top of a sandstone unit. More generally, our data cover a late Katian faunal and climatic shift, known as the Boda event, which is generally interpreted to represent a pre-Hirnantian warming interval. The large positive Paroveja excursion in our data is a signal of part of the event, and possibly a mid-Boda cooling episode. Overall, our data provide a definitive isotopic curve for the upper Katian to lower Hirnantian and the resulting intercontinental chemostratigraphic framework of a biostratigraphically contentious interval exposes previous miscorrelations of isotopic excursions and provides a standard for chronostratigraphic studies of this critical interval in Earth history. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.