GEOLOGY 536/L: Advanced Igneous Petrology (Focus: Arc Dynamics) Fall 2017

Transcription

1 GEOLOGY 536/L: Advanced Igneous Petrology (Focus: Arc Dynamics) Fall 2017 Lecture: M 2:00 4:00 PM (LO 1221) Lab: MW 9:30 AM 10:45 AM Instructor: Dr. Joshua Schwartz Office: Live Oak Bldg., Room 1200 Office Hours: Mondays 8:30 9:30 AM., or by prior appointment joshua.schwartz@csun.edu TEXTBOOK (Optional): Winter, J.D., An Introduction to Igneous and Metamorphic Petrology (2 nd edition); Lecture notes and articles are available for reading and downloading on the Canvas website. Course objectives: This course involves study of arc processes from subduction initiation to arc collapse. We will explore through reading primary literature key concepts in the development of modern understanding of arcs. Introductory lectures will review principles of igneous petrology and geochemistry. We will then explore current research that integrates geochemical tools (e.g., major and trace elements, and isotopes) with geodynamic modeling to investigate how continental crust has evolved in arc settings through time. At the end of this course, students will be able to: 1) describe in detail petrologic characteristics of supra-subduction magmas including their major, trace element and isotopic features; 2) understand various isotopic tracer systems (e.g., Rb-Sr, Sm-Nd, Lu-Hf, O) and their significance in magma evolution studies; 3) clearly articulate arc concepts results to their peers. POLICIES 1. Office hours are listed above. If you cannot meet during office hours, please me and we can set up a different time to meet. 2. Punctual attendance, participation, and mental engagement is essential for success in this class and in life. Please make every effort to show up to class on time. 3. Announcements and assignments will be discussed in class and posted on the Canvas website for this class. Please check it often. 4. Lectures will be posted on Canvas before class. However, as a word of caution, online lectures are not a substitute for coming to class.

2 5. No late work will be accepted or graded for feedback. I am extremely strict about this policy. An assignment is considered late whether it is turned in one minute or one hour after a deadline. 6. No makeup exams will be given. 7. Cell phones may not be used at any time during class or lab. They are disrupting to me and to other students. In the case of an emergency, please leave the class to use your cell phone, otherwise I will confiscate any cell phones used during class time. 8. Computers and laptops are a wonderful resource for taking notes. However, laptops are not to be used during class time to surf the web or play games. If I observe any students using their laptops in this manner, you will be asked to leave. EVALUATION DETAILS GRADING Attendance/Participation 25% Literature presentations 30% Weekly quizzes 25% Field trip outcrop presentation 20% A %; A %; A %; B %; B %; B %; C %; C %; C %; D %; D %; D %; F %. I do not give extra credit. I do not give Incompletes for grades. No exceptions. COURSE FORMAT 1) Each student will present 1 journal article to the class. Papers selected for this course will focus on articles that have made a significant impact on our understanding of arc processes. You will likely find these articles challenging and they will require you to read them several times to master the material in them. I encourage you to meet with me during office hours to make sure that all aspects are understood prior to presenting the article to the class. 2) Each class will start with a 15 minute quiz, with most questions taken from those submitted by the class. The quiz is "open book." The presenter is exempt from the quiz and can begin to prepare for his/her presentation during this time. 3) The presenters will give a minute PowerPoint presentation to the class outlining the major points of the article. At the conclusion of the presentation, the presenter will lead discussion for the remainder of the class. The presenter should have a list of questions ready to ask the class to drive the conversation (see below). Presenting students may wish to prepare handouts and questions ahead of time to guide discussion. Presentations will be graded for clarity, understanding and quality of presentation. A rubric will be handed out prior to presentations.

3 GUIDELINES ON ANALYSIS AND PRESENTATION OF JOURNAL ARTICLES Each presenter is expected to write a two page critique of your paper, following guidelines in the Written Critique of a Journal Article handout. Critiques are due on Canvas each week immediately before the class presentation on Monday. GUIDELINES FOR NON-PRESENTING STUDENT PARTICIPATION As non-presenters, you are required to carefully read the entire article, ask insightful questions, contribute to the class discussion, and provide constructive feedback on the presentation. To provide incentive and to prevent procrastination, you are required to submit a question for each paper that is suitable for the weekly quiz (presenters for that week do not submit questions). These questions must be submitted through Canvas no later Sunday night at midnight before the presentation. The question should address major points and/or questions/controversies discussed in the paper; and the information needed to answer the question must be contained in the article and not depend on additional knowledge of the subject. I will select a question for that week's quiz, but also reserve the right to ask questions that were not addressed by any of you. Your submitted question will be evaluated/scored according to its appropriateness, scope, and/or thoughtfulness. FIELD TRIP Formation of the Sierra Nevada batholith A west-to-east geologic journey across the Mesozoic magmatic arc of the central Sierra Nevada in California, USA (Sept , 2017) A mandatory 4-day field trip is an integral part of this course. Students will read articles on specific aspects of the southern Sierra Nevada and will be expected to give a short, outcrop presentation (15% of the course grade). Arrangements should be made to miss courses and TA assignments for Thursday and Friday (a request for leave to your instructors will be provided on request). We will depart from CSUN at 8:30 AM sharp on Sept 21 from the loading dock. Plan to arrive at 8:00 AM to pack the vans so that we can leave on time. Attendance is mandatory. MISSED CLASSES I expect that you will attend every class unless you are seriously ill. I keep track of attendance as a means of assessing your commitment to the course, and it counts towards your course grade. If you choose to drop the course, it is your responsibility to formally drop the class; I will not administratively drop you from the course. Under normal circumstances, you cannot drop the course after the second week. Only with proof of a serious and compelling reason (see Schedule of Classes) will a student be allowed to drop after the second week. If you decide to drop, please let me know so that a student on the waiting list may take your spot instead. ACADEMIC DISHONESTY Official California State University policy states: The maintenance of academic integrity and quality education is the responsibility of each student within this university and the California State University system. Cheating or plagiarism in connection with an academic program at a campus is listed in Section 41301, Title 5, California Code of Regulations, as an offense for which a student may be expelled, suspended, or given a less severe disciplinary sanction.

4 Academic dishonesty is an especially serious offense and diminishes the quality of scholarship and defrauds those who depend upon the integrity of the campus programs. Such dishonesty includes but is not limited to: cheating, fabrication, facilitating academic dishonesty, and plagiarism. I do not tolerate any form of academic dishonesty. I expect that you will uphold the integrity of the academic environment here at CSUN; however, if I find evidence of academic dishonesty, I will report such evidence to the Office of the Vice President for Student Affairs and recommend disciplinary action. If you are caught cheating in my class, you will be given a failing grade for the assignment and the course. This includes, but is not limited to: plagiarism, copying answers during an exam, facilitating cheating by another student, altering a test grading sheet after the exam, or lying about an excuse for missing the exam. Plagiarism includes the use of paragraphs or even long phrases and diagrams or parts of diagrams from peer or former student assignments.

5 TENTATIVE SCHEDULE: Week Topic Arcs and the Big Picture AUG 28 Introduction to arcs--schwartz SEPT 4 Subduction zone overview Stern (2002) (during lab 9/6) SEPT 11 Architecture and Chemistry of Continental Arcs (Ducea et al., 2015) SEPT 18 Arcs, Carbonates and Climate Change (Lee et al., 2013) SEPT 25 Field Trip debriefing (no in-class presentation) Arcs and Continental Crust Formation OCT 2 Role of Arcs in Making Continental Crust (Jagoutz and Kelemen, 2015) OCT 9 One View of Arc Magmatism (Kelemen et al., 2014) OCT 16 Creating continents by collision and delamination (Lee et al., 2007) OCT 23 GSA--No formal class OCT 30 Modification of arc by relamination (Hacker et al., 2011) NOV 6 Temporal histories of Cordilleran continental arcs: testing models for magmatic episodicity (Kirsch et al. 2016) Arc Insights from the Deep Crust NOV 13 Size and Interconnectivity of Magma Chambers (Coint et al., 2013; Barnes et al., 2016) NOV 20 Production and composition of arc roots (Ducea, 2002) NOV 27 Deep-Crustal MASH Zones revisited (Walker et al., 2015) DEC 4 Transforming Lower Arc Crust (Kelemen and Behn, 2016) DEC 11 DEC 13 AGU--No formal class No formal class

6 Some Sierran Field trip references for petrology outcrop presentations Barth et al Plutonic-Volcanic Connect (Lee Vining) Ducea and Barton, 2007 Arc Flare-up Lackey et al., 2008; 2012 (Role of Basement terranes) Lee et al., 2005 SN xenoliths Memeti et al., 2010 Lobes as Snapshots Paterson et al., 2012 (Episodicity of Arcs) Paterson et al Multiple batches of magma, erosion and recycling Saleeby et al Production and Loss of the SNB root Zandt et al Recent Delamination of SNB root

7 PETROLOGY LABORATORY SCHEDULE Petrology labs will focus on a research theme whereby students will participate in cutting-edge research and application of concepts discussed in lecture. This year the theme will be deepcrustal magmatism in convergent margin orogens. In lab, we will focus on granulites from Fiordland, New Zealand with the aim of understanding the origin of the magmas from which they were formed. Laboratory time will be spent on 1) petrographic analysis and hand sample description, 2) sample preparation and geochemical analysis (x-ray florescence and inductively coupled plasma mass spectrometry), and 3) presentation of results and findings to the class. The class will be divided into 3-4 groups depending on the number of student participants. EVALUATION DETAILS GRADING Attendance/Participation 55% In-lab exercises 10% Final Project presentation 35% TENTATIVE PETROLOGY LAB SCHEDULE: Week AUG 28 SEPT 4 SEPT 11 SEPT 18 SEPT 25 OCT 2 OCT 9 OCT 16 OCT 23 OCT 30 NOV 6 Topic Introduction to lab and project Labor Day. No lab this week. Thin section project Thin section project Thin section project (2 petrographic reports of representative samples due this week) XRF glass bead work XRF glass bead work Sample dissolution for ICPMS Sample dissolution for ICPMS ICPMS analysis ICPMS analysis

8 NOV 13 NOV 20 NOV 27 DEC 4 Geochemical modeling computer lab Data interpretation Data interpretation Final project presentations