Tree-ring based record of intra-eruptive lahar activity: Axaltzintle valley, Malinche volcano, Mexico Cover

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Tree-ring based record of intra-eruptive lahar activity: Axaltzintle valley, Malinche volcano, Mexico

Geochronometria

Volume 43 (2016): Issue 1 (February 2016)

By: Osvaldo Franco-Ramos, Markus Stoffel and Lorenzo Vázquez-Selem

Open Access

|Jun 2016

Figures & Tables

La Malinche volcano is located in the central-eastern part of the Trans-Mexican Volcanic belt (TMVB). The Landsat satellite imagery in composite RGB false colors illustrates the forest cover of the volcano and Axaltzintle valley on its NE slopes (white line). The white dots indicate the sampling sites.

A) Abies religiosa forest growing near the Axaltzintle valley bottom. B) Low terraces point to the deposition of lahar material in the valley whereas trees point to their recent occurrence via impact scars of up to 1 m on their stems. C) Trees buried and impacted by recent lahars. T-1: upper terrace. T-2: lower terrace. AC: active channel.

A) Living trees affected by lahars in general were sampled with increment cores. B) Partial cross sections were taken from a limited number of impact scars. C) Detailed views of different types of growth disturbances in Abies religiosa caused by lahars: injury (I), callus tissue (CT) and tangential rows of traumatic resin ducts (TRD).

Evidence of lahar activity as identified in the trees sampled in the different geomorphic units of Axaltzintle valley. Solid lines are lahars reconstructed with >7 growth disturbances (GD); dashed lines stand for events with 2–5 disturbances. The 19 lines correspond to lahars in the final reconstruction.

Trees affected by the 1998 and 2005 lahars. Gs = growth suppression, TRD = tangential rows of traumatic resin ducts, ExG = eccentric growth, I = injury, Cw = compression wood; and Gr = growth release. For details see text.

Spatial distribution and type of samples in the Axaltzintle valley_

	T-1	T2	Inside of chanel	Total
Tree samples in A. religiosa	56	21	9	86
Increment cores	111	35	11	157
Cross sections	1	3	1	5
Wedges	1	1	4	6
Total	113	39	16	168

Number and percentage of growth disturbances (GD) induced by lahars as reconstructed from the tree-ring records of Abies religiosa in the Axaltzintle valley_

GDs of A. religiosa	No.	%
TRD	105	48
Growth suppression	66	30
Injury	22	10
Eccentric growth	11	5
Compression wood	6	3
Growth release	5	2
Callus tissue	2	1
Total	217	100

DOI: https://doi.org/10.1515/geochr-2015-0033 | Journal eISSN: 1897-1695

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Language: English

Page range: 74 - 83

Submitted on: Jul 7, 2015

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Accepted on: Feb 2, 2016

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Published on: Jun 11, 2016

Published by: Sciendo

In partnership with: Paradigm Publishing Services

Publication frequency: 1 issue per year

Keywords:

Malinche volcano,

dendrogeomorphology,

tree-ring analysis,

Abies religiosa

Related subjects:

Geosciences, other

© 2016 Osvaldo Franco-Ramos, Markus Stoffel, Lorenzo Vázquez-Selem, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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